Floating Wetlands Bring Nature Back to Baltimore’s Inner Harbor

Harbor Wetland at National Aquarium, Baltimore, Maryland. Ayers Saint Gross / Phillip Smith, courtesy of National Aquarium

The National Aquarium’s new Harbor Wetland shows the great potential of creating wildlife habitat in cities. With just 10,000 square feet, it has already drawn otters, herons, ducks, crabs, fish, eels, and jellyfish.

Harbor Wetland at National Aquarium, Baltimore, Maryland. Ayers Saint Gross / Phillip Smith, courtesy of National Aquarium

The $14 million constructed wetland in Baltimore, Maryland was designed by landscape architects at Ayers Saint Gross, a multidisciplinary firm. It improves the harbor environment and advances research and innovation. It’s also a free educational landscape that inspires the public to reconnect with nature.

“Harbor Wetland is an example of how to marry science and art,” said Amelle Schultz, ASLA, PLA, a principal and landscape architect with Ayers Saint Gross. “It leaves no doubt that landscape architecture is a STEM discipline.”

Schultz said the floating wetland may look simple but in reality it’s a complex work of design and engineering. “Only about one-third of the project is visible; two-thirds is below the surface.”

Harbor Wetland at National Aquarium, Baltimore, Maryland. Ayers Saint Gross / Phillip Smith, courtesy of National Aquarium

The wetland has many layers. More than 32,000 native tidal marsh shrubs and grasses form the top. They were planted in recycled plastic matting that will allow the plant roots to grow down into the water, providing habitat for dozens of species and filtering harbor water.

Harbor Wetland at National Aquarium, Baltimore, Maryland. Ayers Saint Gross / Phillip Smith, courtesy of National Aquarium

Amid these plants are shallow channels, with beds of oyster shells that provide additional habitat. Compressed air is pumped into these channels, bringing dissolved oxygen into the harbor and keeping water circulating, like in a natural tidal marsh.

Harbor Wetland at National Aquarium, Baltimore, Maryland. Ayers Saint Gross / Phillip Smith, courtesy of National Aquarium
Harbor Wetland at National Aquarium, Baltimore, Maryland. Ayers Saint Gross / Phillip Smith, courtesy of National Aquarium

This entire system sits on top of another layer of custom pontoons. Their buoyancy is adjusted as the weight of the wetland increases with plant growth. The pontoons also support the walkways and outdoor classroom spaces that line the installation. “Traditional constructed wetlands eventually sink under their weight — this one won’t,” Schultz said.

Sitting at the end of the classroom space, hundreds of feet into the harbor, there is a moment of serenity. It’s easy to forget about all the engineering and technology and just imagine you are in a natural wetland.

Harbor Wetland at National Aquarium, Baltimore, Maryland / Jared Green

And the project also makes it easy to imagine more wetlands. The project supports the aquarium’s long-term ecological research and will inform the creation of future constructed wetlands. The system is designed to help make the case: Sensors embedded in the wetland test the water quality, and researchers are documenting species populations.

Schultz thinks one measure of the project’s success is the incredible range of species that now visit. “The aquarium’s interior exhibitions are built to be natural, but the animals can’t leave. The animals that visit the wetland choose to be here,” she said. Some of the species that visit were a surprise: “American eels are really hard to find in the harbor.”

The grasses are important habitat for many species the aquarium wants to track. As they were growing in, the aquarium even added a plastic coyote to scare off geese, which would have made a meal of them. “It’s more of a joke now than a deterrent,” said Shelley Johnson, ASLA, PLA, senior associate with Ayers Saint Gross.

Harbor Wetland at National Aquarium, Baltimore, Maryland / Jared Green

Harbor Wetland also builds on research conducted on a smaller prototype just a few feet away in the same bulkhead, which was initiated more than 10 years ago. Ayers Saint Gross worked with Biohabitats, McLaren Engineering Group, and Kovacs, Whitney & Associates to advance an initial concept created by Studio Gang.

National Aquarium wetland prototype, Baltimore, Maryland / Jared Green

“Even in the prototype, the aquarium team saw small fish come to the small stream in the middle of the wetland. No one expected that to happen,” Schultz said.

The aquarium thinks Harbor Wetland will boost the local economy. “The wetland will bring more people to the inner harbor,” Johnson said. “Not everyone can afford tickets to the aquarium, but they can visit this.”

School groups are already visiting, where they are given tours by aquarium researchers. The mural that frames the project expresses the aquarium’s hope that more young people in Baltimore will be inspired to join the effort to restore the Chesapeake Bay.

Harbor Wetland at National Aquarium, Baltimore, Maryland. Ayers Saint Gross / Phillip Smith, courtesy of National Aquarium

“Landscape architects led the team to the solution — the technical and scientific aspects, and married that to the public realm,” Schultz said.

The technical work alone realized benefits: their innovations led to a new patent application focused on the integrated buoyancy and aeration system.

Co-Creating a Future That Heals Land and Culture

Bison in Yellowstone National Park / Fokusiert, istockphoto.com

“Indigenous Peoples were the first landscape architects of this continent,” said Lyla June Johnston, during the opening general session of the ASLA 2024 Conference on Landscape Architecture in Washington, D.C. “We have been stewards of this land and made it beautiful and edible. We fed the Earth instead of just letting it feed us.”

Chestnut forests once spanned the east coast from Maine to Georgia, before a blight decimated the trees. “These were not wild forests, but planted by Indigenous Peoples. And Native land stewards evolved those landscapes over time.” Scientists know this from studying soil core samples and fossilized charcoal going back 10,000 years. The data shows that chestnut and hickory trees dramatically spiked 3,000 years ago, and black walnut 2,000 years ago.

Chestnut Grove, Virginia / AidanWarren, istockphoto.com

In the Pacific Northwest, there were once vast, cultivated clam gardens. “You can see them from ancient clam garden walls that augmented natural clam habitat.” These gardens were co-designed with clams because “they are equal to us and have their own nationhood status.”

Clam garden in the Broughton Archipelago, British Columbia, Canada / Wikipedia, Simon Fraser University, CC BY 2.0

In the Illinois region, Indigenous People burned prairies for thousands of years to “maximize productivity and regain nutrients,” Johnston said. “Fire brings new life to the prairie. Flowers emerge in the spring.” Ash from fires also nourished soils and created nutrient-rich grasses that made habitat for bison and deer. “Indigenous Peoples passed on this great heirloom for thousands of years to their children— a living soil system.”

In the Washington, D.C. area, Indigenous Peoples cultivated oyster fisheries for more than 3,000 years. Oyster populations of the Chesapeake Bay are less than 1 percent of what once was.

Johnston is an Indigenous Artist, Musician, Scholar, and Community Organizer of Diné (Navajo), Tsétsêhéstâhese (Cheyenne), and European lineages. She argues that land stewardship should be restored to Indigenous Peoples given they are far better at creating and restoring habitat than Western people.

“People can be a gift, not a virus. We can be creators and a keystone species. We can be in service to the land. We can create edible landscapes that support the well-being of all,” she said.

But to become a keystone species and support global regeneration once again, people need to “first landscape their inner world before they landscape the outer world.” Our global society needs to shift its mindset. Instead of exploiting nature, we need to be its guardian. “Think of a bird bath — it’s not for us, but lets birds rest, drink, and bathe.”

Johnston argued that communities could give more land back to Indigenous Peoples because their guardian mindset is so crucial to protecting biodiverse places and restoring them. “Worldwide, Indigenous Peoples are 5 percent of the population but we manage 80 percent of global biodiversity. Give us more land to manage. We are good at this.”

Johnston was followed by Julia Watson, Author, Lo—TEK Design by Radical Indigenism; Principal, Julia Watson llc; and Co-founder Lo—TEK Institute. She understands traditional ecological knowledge as “inter-related networks of knowledge.”

After many years of working with Indigenous communities and designers, “I came to understand this knowledge is relational and shaped by time and place. It’s different from Western science; Indigenous knowledge is interconnected.”

“There are vast networks of knowledge developed over long periods of time. These networks of knowledge enabled ancestral people to survive and adapt to climate change over thousands of years. You can’t separate their technologies from the people; they are co-evolutionary.”

Watson offered an example: the sea fishing techniques of the Yap people of Micronesia. They created artificial reefs and weirs that catch fish in the outgoing tides. “The technology is 1,000 years old.”

Aech Fish Weirs of the Yap People of Micronesia / Bill Jeffrey, courtesy of Julia Watson
Aech Fish Weirs of the Yap People of Micronesia / Bill Jeffrey, courtesy of Julia Watson

With the colonization of the region, this Indigenous technology was no longer used for fishing. But even after falling into disrepair, the legacy of the infrastructure forms breakwaters that protect these communities today.

Watson said these systems can be brought back along with other traditional ecological knowledge (TEK) systems created by Indigenous communities around the world.

After the success of her book Lo-TEK, Watson has written a follow-up – Lo-TEK: Water, which focuses on ancestral aquatic technologies. It will be released in the spring of next year. The new book includes 22 case studies of traditional infrastructure and 22 contemporary projects infused with TEK that “rebuild ancient knowledge and highlight Indigenous traditions of adapting to climate change.” She organized these technologies in multiple categories: living, co-evolutionary, sovereign, symbiotic, and cyclical.

Watson’s goal is to bring ancestral technologies back into the global discussion about solutions to the biodiversity and climate crises. “Ancestral infrastructure has been deliberately excluded from these conversations. There has been an unlearning of these histories, even though Indigenous People have created the oldest man-made structures on Earth.”

A young fisherman walks under a living root bridge at Mawlynnong village, India. In the relentless damp of Meghalaya’s jungles the Khasi people have used the trainable roots of rubber trees to grow Jingkieng Dieng Jri living root bridges over rivers for centuries. / © Amos Chapple, courtesy of Julia Watson

Books are just one way she advocates for the inclusion of Indigenous design knowledge. The Lo-TEK Institute also offers a Living Earth curriculum for high-school and college level students, featuring 10 Indigenous, nature-based innovations.

And she’s working with firms like Buro Happold to “co-create hybrid technologies of the future” and with attorneys like Comar Molle to protect the intellectual property of Indigenous Peoples. “We can co-create infrastructure with Indigenous knowledge,” protecting their intellectual property at the same time.

Symbiocene exhibition / Dezeen, courtesy of Julia Watson
Symbiocene exhibition / Tim P. Whitby, courtesy of Julia Watson

Watson used her keynote to announce a historic call to action with ASLA and Indigenous partners: Co-create a future that heals land and culture. The call to action was developed by Watson, Johnston, the Indigenous Society of Architecture, Planning, and Design (ISAPD), and ASLA and its Biodiversity and Climate Action Committee. It outlines three key strategies:

  • Respect Indigenous Knowledge
  • Empower Future Generations
  • Help build an Indigenous landscape architects’ network of ASLA members and work in collaboration with groups like ISAPD

During a follow-up conversation with Watson and Johnston, José de Jesús Leal, ASLA, Principal and Director, Native Nation Building Studio, MIG, and member of the ASLA Biodiversity and Climate Action Committee, kicked-off the discussion by asking: “Can Indigenous knowledge outpace our current problems?”

Paul Fragua, a Tribal Elder and architect at MIG, said that while landscape architects and ASLA are celebrating 125 years of American practice this year, Indigenous Peoples have 3,000 years of experience stewarding landscapes. “We need to get started on the next 3,000 years. There is an urgency not for me, but for future generations.”

Johnston sees the landback movement, which has grown in the past five years, as a key way to address our current challenges.

While Native communities are buying land themselves, it’s usually less than 100 acres at a time. “The U.S. government, churches, and private landowners in the U.S. have hundreds of thousands of acres that could be returned to Native stewardship.”

In a few instances, public parks are now being co-managed by the National Park Service and Native Nations. “Having Native Americans in positions of leadership in the Department of Interior and National Park Service enabled that,” she said.

“There are two barriers — getting land back plus a lack of resources,” Leal said. “Native Nations have to be able to take care of the land they get back. It’s not just the actual property, but deep collaboration with the land.”

One approach may help increase resources. In the San Francisco Bay Area, there’s a voluntary land tax people can pay to support local tribal communities. “You can pay it whether you rent or own,” Johnston explained. The funds enable Native communities to buy back more land. Johnston wants to see more of those kinds of funds go directly to grassroots Native community leaders and non-profits that are “revitalizing land and culture.”

To outpace our problems, Watson thinks the “software” that runs our societies needs to change. “A value system is a compass of how to live. These value systems are rooted in a cultural worldview.”

In New Zealand, the Maori have a “software that guides how they take care of the land.” That software shapes their language, which is place based. In effect, their beliefs and worldview and how they communicate are tied to places. “So when we design systems in these places, we need to build the cultural framework of the communities. The belief system is the core.”

Fragua noted that in New Mexico, Pueblo peoples view some mountain peaks as sacred. They are places that transcend this world and connect us to the spiritual world. That is another example of a belief system rooted to a place.

Shiprock, Diné (Navajo) Nation, New Mexico / Wikipedia, Bowie Snodgrass, CC BY 2.0

Landscape architects asked the group questions about how to implement these ideas in contemporary projects.

Johnston and Watson said it’s important to hire Indigenous designers. And Leal added that it’s important to set those relationships in truth. “We need to start fresh relationships and beat stereotypes.” When reaching out to Indigenous designers and communities, “reach out and ask for their voice, but respectfully.”

They also noted that Indigenous design doesn’t necessarily mean creating room for nature at the expense of people. “Indigenous people designed some of the most densely populated cities in South America,” Johnston said. And it’s also not about rewilding landscapes. “American landscapes were never wild to begin with. They were always managed.”

Non-Indigenous designers can also work to “interrupt the harm,” Watson said. “You can document what has been erased and ensure Indigenous landscapes aren’t forgotten.”

Fragua said that many Indigenous communities follow the “great law of peace because there has been so much war. Resilience comes now from resistance [against inequality]. The creator wants us to live as equals.”

And for too long, there has been a separation between people and nature. “We need an integrated approach, a unity where we are part of the world,” Johnston said. Communities need to return to an ancient Indigenous philosophy: “We live in Earth and are born of the Earth. Landscape is a part of ourselves.”

“Culture is living and can change.”

Landscape Architecture Solutions to Climate Change Generate Significant Economic Benefits

Thornton Creek Water Quality Channel, Seattle, Washington / MIG

ASLA Fund releases new research on the economic benefits of nature-based solutions

The American Society of Landscape Architects (ASLA) Fund, a 501(c)(3) organization, has released a new brief on the economic benefits of landscape architecture and nature-based solutions.

The brief is developed for global and U.S. economic policymakers meeting at the UN Framework Convention on Climate Change (UNFCCC) COP29 in Baku, Azerbaijan. ASLA is an official observer of the COP process, and its representatives have attended COPs for the past three years. Pamela Conrad, ASLA, PLA, Founder, Climate Positive Design, is ASLA’s delegate this year.

Dr. Jennifer Egan, PhD, program manager, University of Maryland Environmental Finance Center (EFC) in the School of Architecture, Planning, and Preservation developed the summary and economic benefit estimates. The EFC received a grant from the ASLA Fund to develop these analyses, which summarize findings from research literature, national and international reports, and 175 case studies.

The brief finds that landscape architects increase economic value through their approach to planning and designing nature-based solutions.

Their work on nature-based solutions creates economic benefits in five key areas:

  • Improved Human Health and Livability
  • Expanded Investment and Sustainable Jobs
  • Increased Biodiversity
  • Going Beyond Net-Zero
  • Strengthened Resilience

The Environmental Finance Center created the brief and a supplementary analysis:

Landscape Architecture: Maximizing the Economic Benefits of Nature-based Solutions Through Design: A 10-page brief that summarizes estimates of economic benefits for global and U.S. policymakers.

An Analysis of Benefit Values: 175 Landscape Architecture Case Studies in the U.S.: A 12-page supplementary analysis for economic and landscape architecture researchers and educators that explores economic benefits found in the Landscape Architecture Foundation (LAF)’s Landscape Performance Series Case Study Briefs.

“We listened to global policymakers last year at COP28 in Dubai. They seek to scale up investment in nature-based solutions but need to know how much these solutions cost and their economic benefits,” said ASLA CEO Torey Carter-Conneen, Hon. ASLA.

“We now have some solid numbers that show landscape architects generate significant economic value through the way they design these solutions. But we’ll also start an ambitious research agenda to calculate the economic benefits we currently can’t measure.”

Dutch Kills Green, Queens, New York (before). WRT and Margie Ruddick Landscape / WRT
Dutch Kills Green, Queens, New York (before). WRT and Margie Ruddick Landscape / WRT

Highlights include:

  • Nature-based solutions such as rain gardens, bioswales, and green roofs effectively manage stormwater. These features can be constructed for 5-30 percent less and maintained for 25 percent less than conventional gray infrastructure.
  • Every dollar invested in ecosystem restoration returns $5 to $28 in benefits, depending on the ecosystem.
  • Urban trees provide approximately $88 billion (US$ 2024) in carbon sequestration annually.
  • Every dollar invested in parks and green space can generate between $4 and $11, due to increased tourism, improved property values, and enhanced community health.

ASLA’s Climate Action Plan identified the need for this economic benefits work.

At COP29, Landscape Architects Will Workshop Landscape Solutions to Climate Change with World Leaders

Pamela Conrad, ASLA / Climate Positive Design (left); Kotchakorn Voraakhom, International ASLA / Landprocess (right)

Delegates will highlight the key role of landscape architecture strategies in maximizing the benefits of nature for people and communities

ASLA will be represented by two delegates at COP29 in Baku, Azerbaijan. This is the third year ASLA has been an NGO observer to the UN Framework Convention on Climate Change (UNFCCC) Conference of Parties (COP) process.

ASLA’s delegate:

And the landscape architect delegate of the Government of Thailand:

At COP29, Conrad and Voraakhom will host Working with Nature: Landscape Action in National Adaptation Plans, a workshop for global policymakers in the blue zone, the delegate area of the conference. The event is organized by the UNFCCC, Climate Positive Design, ASLA, Landprocess, and IFLA. Location, date, and time: Blue Zone, Thailand Pavilion, November 18, 2-4 PM, Azerbaijan.

“Every member nation of the UN has committed to creating National Adaptation Plans by 2025. These plans can either continue business-as-usual – or advance smart nature-based solutions. Pamela and Kotch will show policymakers how to design with nature, so communities can adapt to climate impacts but also reduce emissions and restore ecosystems at the same time. It’s the start of such important global work,” said ASLA CEO Torey Carter-Conneen, Hon. ASLA.

“This is the first major blue zone workshop on landscape solutions hosted by the UN and guided by landscape architects. We’re excited to lead an event where notable country leaders and technical experts will present success stories and lessons learned throughout the world. Together, we will explore pathways to scaling up nature-based solutions,” Conrad said.

At the event, Conrad will introduce WORKS with NATURE, a new guide being developed by Climate Positive Design in collaboration with Landprocess. The guide has been spearheaded by Conrad as part of her two-year ASLA Biodiversity and Climate Action Fellowship.

The guide highlights 100 low-carbon nature-based techniques that help communities adapt to extreme heat, flooding, wildfire, and drought while supporting health and biodiversity.

Half of the techniques are found in developing countries and half in developed countries, with 38 countries represented. There is also an even mix of rural and urban techniques.

ASLA 2019 Professional General Design Honor Award. Chulalongkorn University Centenary Park. Bangkok, Thailand / LANDPROCESS, Suratchana Pakavaleetorn

Landscape architecture delegates will also present at these blue zone sessions:

Rethinking Our Cities: Leveraging Urban Planning and Design Solutions for Sustainable Buildings, Neighborhoods, and Lifestyles
Location, date, and time: Buildings and Cooling Pavilion, Blue Zone, International Code Council (ICC) Pavilion, Number G10, 20 November 20, 5-6 PM, Azerbaijan
Organizers: UN-Habitat, Laudes Foundation, ASLA, IFLA, Climate Positive Design, Architecture 2030, and Harvard University Graduate School of Design

Strategic Foresight in Support of Visioning for Future Resilience
Location, date, and time: Blue Zone, November 20, 1:45-3:45 PM, Azerbaijan
Organizers: UNFCCC, IFLA

Pathways to Nature-Positive Solutions: Integrating Nature-Based Solutions into Urban Infrastructure Design
Location, date, and time: Buildings and Cooling Pavilion, Blue Zone, November 21, 4-5.30 PM, Azerbaijan
Organizer: UN Habitat, IFLA

Nature Positive Cities: Pathway to Urban Adaptation and Transformation
Location, date, and time: Thailand Pavilion, Blue Zone, November 14, 11 AM-12 PM, Azerbaijan
Organizers: UN Habitat, World bank, Bangkok Metropolitan Administration, Japan International Cooperation Agency, United Nation University, IFLA

“Key topics include integrating green infrastructure, restoring biodiversity, and using nature-based solutions for flood management and air quality improvement. Experts will discuss the role of financial tools, which provide funding for climate resilience projects and support urban areas in recovering from climate-related disasters. This comprehensive approach prioritizes ecological health and urban livability, offering adaptable frameworks for building climate-resilient cities.”

Building Inclusive and Resilient Communities: From Net Zero Campuses to Sustainable Urban Development
Location, date, and time: Thailand Pavilion, Blue Zone, November 16, 10-11 AM, Azerbaijan
Organizer: National Higher Education, Science Research, and Innovation Policy Council (NXPO), United Nation University, IFLA

“This discussion will explore innovative strategies for fostering sustainable and inclusive communities through diverse lenses of development. NXPO will share insights on creating Net-Zero campuses as models for sustainable education and research spaces that drive climate action.”

Nature-Inspired Design for Resilience: Redefining Sustainability in Climate Action
Location, date, and time: Thailand Pavilion, Blue Zone, November 16, 2-3 PM, Azerbaijan
Organizers: IFLA, Dersyn Studio, Chulalongkorn University, United Nation University

“This session focuses on the role of architecture in advancing climate resilience, focusing on sustainable design, adaptive building materials, and energy-efficient systems. It will showcase strategies for creating climate-responsive structures that reduce emissions, manage resources sustainably, and integrate seamlessly with local environments. These strategies promote resilience and adaptation in urban spaces.”

Harmonizing Futures: Bridging the Digital Divide with AI and Indigenous Knowledge for Climate Action and a More Inclusive and Sustainable World
Location, date, and time: Thailand Pavilion, Blue Zone, 1-2 PM, Azerbaijan
Organizers: United Nation University, Intergovernmental Panel on Climate Change, Center of Excellence in Indigenous Knowledge Systems, University of KwaZulu-Natal, South Africa, Institute for Environment and Human Security, United Nations Economic Commission for Africa, IFLA

“This high-level dialogue addresses the urgent intersection of climate change and human health, focusing on how environmental shifts impact public health and healthcare resilience. Experts and policymakers will discuss strategies to bridge climate and health policies, explore adaptive healthcare infrastructure, and assess risks posed by climate-induced diseases.”

Urban Climate and Human Health: Building Resilience for Thriving Cities
Location, date, and time: Thailand Pavilion, Blue Zone, November 20, 10-11 AM, Azerbaijan
Organizers: The Cultural Landscape Foundation, Monash University, IFLA, and National Health Institute

“This session explores how resilient infrastructure, green spaces, and sustainable policies can mitigate health risks posed by climate change. Experts will discuss strategies for reducing heat, improving air quality, and creating healthier urban environments, emphasizing the importance of climate-responsive planning to support thriving, resilient communities.”

Yerba Buena Island, San Francisco, California / CMG Landscape Architecture

At COP29, our member leaders will explain how landscape architects design nature-based solutions that create real benefits for people and communities:

1) Increased Biodiversity
Nature-positive landscapes are the foundation of terrestrial ecosystems and efforts to achieve the goals of protecting 30 percent of ecosystems by 2030 (30 x 2030) and 10% net biodiversity, restoring global ecosystems, and increasing and protecting biodiversity.

2) Improved Human Health and Livability
Accessible public landscapes, such as parks and recreation areas, provide proven physical and mental health benefits that reduce healthcare costs and increase community cohesion.

3) Going Beyond Net-Zero
Landscapes are the most efficient way to store carbon and achieve zero embodied and operational emissions and double carbon sequestration by 2040.

4) Strengthened Resilience
Healthy, biodiverse landscapes that store carbon in trees, plants, and soils also increase people’s resilience to climate impacts, such as extreme heat, flooding, drought, and sea level rise.

5) Expanded Investment and Sustainable Livelihoods
When woven into communities, nature-based solutions become resilient assets that lead to increased investment in housing, infrastructure, and public amenities, and create sustainable local livelihoods.

De-Pave Park, Alameda, California / CMG Landscape Architecture

Design Strategies for Increasing Biodiversity

The Phillip Island Penguin Parade visitor center in Victoria, Australia, restores the surrounding ecosystem while providing an up-close experience for viewing penguin migration. / @phillip island nature parks, Underground Viewing Penguin Parade

By Pamela Conrad

The world has lost 60 percent of animal populations since 1970. This staggering decline reflects the growing pressures on ecosystems, from habitat destruction to climate change. And 1 million species now face threats of extinction. As these problems continue to escalate, the importance of preserving biodiversity and restoring ecosystems becomes clearer.

The term biodiversity – which means the variety of all life on Earth – is new to many. But it has been present in the work of landscape architects for decades.

There are key ways we can increase biodiversity:

Preserve

The simple importance of preserving biological life cannot be overstated. Much of the developed world’s historic response to impacting ecosystems has been mitigation. Yes, before it was a term used in reference to climate change.

It means that if you impact an ecosystem for whatever you want, all you need to do is relocate and recreate it in another location. No big deal, right?! Wrong.

Ecologists and biologists know that this is not as simple as it sounds. There are many difficulties, resulting in a low success rate for ecosystem regeneration.

The preservation of Sacred Groves around the world can serve as inspiration for our efforts. They are areas of natural forest that contain rare collections of plants and animals. They are preserved by local communities due to their religious beliefs. Focusing on them holds great potential for the preservation of biological diversity and ecological functions and maintaining cultural ritual and belief systems.

The Osun-Osogbo Sacred Grove is a UNESCO World Heritage Site in Nigeria. It’s a lush forest with shrines, sculptures, and the Osun River. Annual festivals celebrate and promote cultural heritage preservation. / Wikimedia Commons, Obibillion1, Creative Commons Attribution-Share Alike 4.0 International

Sacred Groves have historically been a shared resource connected to culturally-based conservation strategies. They are where people engage in practices combining botanicals, ritual, music, and dance that call upon natural energies, cultivating awareness.

As cities densify, the preservation of these places is increasingly threatened. But urban nature is at the root of many spiritual traditions so they must be protected.

Restore

Preservation is best, but we should take every opportunity to restore ecosystems where we can.

Working with ecologists and biologists is key to understanding the nuanced details — from soil regeneration to species selection, and planting arrangements that support habitable conditions.

We can apply some key strategies, like incorporating native plants, flower- and food-producing species, and structural diversity in terms of plant arrangement. These are outlined in ASLA’s Climate Action Field Guide and the Climate Positive Design Toolkit.

These approaches are evident in Tract’s project, Penguin Parade Visitor Center. After acquiring the Summerland Estate in Phillip Island, Victoria, a landmark conservation decision in Australia, the historic peninsula was carefully planned to enhance and restore native wildlife habitat. Home to the renowned Penguin Parade, the project applied a “first principles” approach to design, significantly expanding habitats and adding new penguin viewing facilities. (See image above)

The focus was on creating a memorable experience when penguins return from the sea to their burrows. From specially designed viewing platforms, guests can get a closer look at the penguins without interfering with their natural routines. The boardwalks are thoughtfully integrated into the natural surroundings and incorporate a lighting design that provides a safe viewing experience.

Connect and Create

Harkening back to Richard Foreman’s Land Mosaics, a book still on my shelf since landscape architecture grad school, I am reminded of the simple terms that outline the interconnection of habitats.

Habitat “patches” are areas of suitable habitat for species, while a “corridor” is a narrow strip of habitat that connects isolated habitat patches. Continuity and connectivity of corridors are critical to maintain, create, or restore healthy and resilient ecosystems.

Freeways, highways, and roads fragment and disrupt wildlife habitats, damage natural systems, and endanger both people and animals. In the U.S., 1 to 2 million wildlife-vehicle collisions occur each year, which has resulted in $8 billion in damages and around 200 human deaths from deer-related accidents.

To address these issues and reconnect fragmented habitats affordably, the Center for Large Landscape Conservation introduced the Animal Road Crossing (ARC) International Wildlife Crossing Infrastructure Design Competition.

The ‘Hypar-nature’ Wildlife Bridge by Michael Van Valkenburgh Associates is a unique single-span habitat bridge that uses prefabricated concrete modules. This connection extends the existing habitat across the bridge and over the traffic below by creating a vaulted structure with distinct habitat bands that create multiple zones to safely guide a variety of animals across.

The design includes forms that are easy to replicate and produce in a cost-effective way, minimize site disruption, and adapt to changing migration patterns.

Land bridges provide safe passage for wildlife while connecting habitats. Gathering Place, Tulsa, Oklahoma, Michael Van Valkenburgh Associates / Scott Shigley

These strategies are already part of many landscape architects’ practices. But we are now more aware of the need to measure, monitor, and track our impacts.

Measure

In 2020, the Montreal COP15 paved the way for adopting the Kunming-Montreal Global Biodiversity Framework, setting four goals, including protecting at least 30 percent of the world’s land and ocean by 2030.

Other initiatives have emerged, including supporting the UN Decade of Ecosystem Restoration through biodiversity-positive projects that achieve at least 10 percent biodiversity net gain (BNG). This is in line with the UK’s mandate for a 10 percent increase from pre-development biodiversity levels. All of these are targets in ASLA’s Climate Action Plan.

The recently launched Pathfinder 3.0 now guides landscape designs on biodiversity. Projects can have positive or negative impacts.

We must prioritize these goals in our designs:

  • Protect existing ecosystems
  • Restore native and ecologically appropriate ecosystems
  • Design planting based upon the plant communities and habitats of the local eco-region

Project teams should include ecologists to make field observations of a pre-construction site and provide nuanced information and guidance. To encourage biodiversity-positive planning, design, and engineering, the new Pathfinder 3.0 includes some basic biodiversity impact calculations outlined in a Methodology Report and User Guide.

As always, this is a work in progress, and there is much more to be done. But one step forward is the first step in making positive change.

Pamela Conrad, ASLA, PLA, LEED AP is a licensed landscape architect, the founder of Climate Positive Design, faculty at Harvard’s Graduate School of Design, and ASLA’s inaugural Biodiversity and Climate Fellow. She was the chair and lead author of ASLA’s Climate Action Plan, 2019 LAF Fellow, 2023 Harvard Loeb Fellow and currently serves as IFLA’s Climate and Biodiversity Working Group Vice-Chair, World Economic Forum’s Nature-Positive Cities Task Force Expert, Carbon Leadership Forum ECHO Steering Committee, and is an Architecture 2030 Senior Fellow.

Flood Defenses Can Enhance the Public Realm

Brooklyn Bridge and Montgomery Coastal Resilience (Gates open) / AECOM
Brooklyn Bridge and Montgomery Coastal Resilience (Gates closed) / AECOM

Superstorm Sandy inundated Lower Manhattan, causing billions in property and infrastructure damage.

To protect against future flooding, storm surges, and sea level rise, landscape architects are developing an innovative mix of green and grey solutions along the southern coast of Manhattan.

These are not nature-based solutions but forms of armor. And designers are showing how this armature can be woven into the public realm, creating new kinds of infrastructure.

Smart design is resulting in retractable gates and walls, landscaped berms, and raised platforms. No concrete walls separating communities from each other or the waterfront here.

The concept behind this effort is called the Big U and it came out of the Rebuild by Design competition funded by the U.S. Department of Housing and Urban Development (HUD) in the aftermath of Sandy. Since then, billions in federal, state, and city funds have gone to making the plan a reality.

The plan is being designed and implemented through the Lower Manhattan Coastal Resilience Program. This effort spans many jurisdictions and includes lots of sub-projects, explained Gonzalo Cruz, ASLA, vice president of landscape and urban design at AECOM, during an event organized at the offices of SCAPE as part of Climate Week NYC.

Lower Manhattan Coastal Resilience Program / AECOM

AECOM has developed the master plan for the projects. “There are twelve teams on board, with lots of public sector leader and community participation — many invested parties at the table,” Cruz said.

All teams are united behind the goal of creating new infrastructure that reduces flood risk but also creates places people want to be in.

Under FDR Drive on the east side of Lower Manhattan near the Brooklyn Bridge, AECOM is adapting the design standards for the former East River Esplanade Masterplan designed by Ken Smith Workshop and Shopp Architects.

A series of retractable gates are being woven into the park along the East River. “They are like transformers; think of them as a mechanically operated landscape,” Cruz said. “During major storm surges, they will operate and flip up.”

Brooklyn Bridge and Montgomery Coastal Resilience (Gates open) / AECOM
Brooklyn Bridge and Montgomery Coastal Resilience (Gates closed) / AECOM

The gates enable the landscape architects to keep the waterfront as open and accessible as possible during good weather.

Further north on the east side, landscape architects with MNLA are bolstering 2.4 miles of riverfront from Montgomery Street to 25th Street. Nearby communities are in the floodplain. During Sandy, many of the housing developments were hit hard and isolated by rising waters, so the plan also addresses their risks.

East Side Coastal Resilience Program / MNLA

The East Side Coastal Resilience Program reimagines a necklace of neighborhood parks, incorporating new coastal defenses. How the defenses are integrated also changes along the length of the riverfront.

The new riverfront parks will be eight feet above the river and essentially built on top of the existing parks. “The new parks include flood protection elements, and portions of the East River Park are elevated to connect to new pedestrian bridges,” said Molly Bourne, FASLA, a principal at MNLA.

East Side Coastal Resilience Program / MNLA

To improve the resilience of the landscapes, MNLA added in a diverse range of soil mixes, trees, and plants that can handle “wind, waves, inundation, and salt.”

A narrower segment of the linear park includes a defensive berm with that resilient soil, tree, and plant system. But it still provides ample space for bike lanes and pedestrians.

East Side Coastal Resilience Program / MNLA

A new pedestrian bridge high over FDR Drive will improve access to the waterfront while ensuring the community will not be isolated in the next superstorm.

The Big U continues around to the west side of Lower Manhattan. There, landscape architects at SCAPE and BIG have been designing the Battery Park City Resilience Projects.

In seven projects, “we are using berms, platforms, hills, and retractable gates to create a line to stop the water,” said Greta Ruedisueli, ASLA, an associate with SCAPE. They are all “strategically placed” to blend into the communities.

Battery Park City Coastal Resilience Projects / SCAPE and BIG/CSM

In some neighborhoods, existing waterfront platforms are being raised and rewoven into the community.

Battery Park City: Reach 2 (Existing conditions) / SCAPE and BIG/CSM
Battery Park City: Reach 2 (Proposed design) / SCAPE and BIG/CSM

And in others, subtle grade changes and berms help maintain the line of defense, while flood walls built into constructed hills ensure no river surge will seep underground into the community.

The grade changes and land forms enable SCAPE and BIG/CSM to increase biodiversity through native trees and plants and provide spaces for residents and visitors to sit and take in the nature.

Battery Park City: Esplanade and Ferry Terminal (Existing conditions) / SCAPE and BIG/CSM
Battery Park City: Esplanade and Ferry Terminal (Proposed design) / SCAPE and BIG/CSM

In Rockefeller Park, an artful flood wall is being stitched into a housing development. “The wall is a textural element. It can be concealed when it is high through material, color, and hue,” said Rachel Claire Wilkins, Affil. ASLA, a senior landscape designer with BIG/CSM.

Rockefeller Park: Proposed wall design / SCAPE and BIG/CSM

All this new infrastructure is being designed for the future. “We expect flooding to be higher in 25-50 years,” Wilkins said.

It is also being designed to flood and then bounce back from inundation. “Occasional flooding will be OK,” Bourne said. “What is important is that the landscapes remain usable up to the water’s edge.” To ensure that, all the infrastructure below ground and plants and soils are being designed to adapt to inundation.

Bourne thinks these projects are “precedent-setting” because they haven’t been done before in a dense area like Lower Manhattan. “We are in new territory. But we have designed this infrastructure to be easier to maintain in the future.”

Cruz said other landscape architects working on coastal flood defenses need to understand how the engineering works before bringing design ideas to the table.

“You will be crushed if you don’t understand the mechanisms. We can’t be too tree hugger-y. These systems have to perform. It’s about how to make them last the longest and provide the most benefit to the most number of people.”

The Landscape Architecture Community Will Push for Protecting and Restoring Ecosystems at the Convention on Biological Diversity

Dr. Sohyun Park (left); MaFe Gonzalez / BASE Landscape Architecture (right)

ASLA representatives will showcase projects that increase biodiversity at COP16 in Cali, Colombia

ASLA announced that Dr. Sohyun Park, ASLA, PhD, Associate Professor of Landscape Architecture, University of Connecticut, and MaFe Gonzalez, ASLA, Landscape Designer and Botanist, BASE Landscape Architecture, will represent ASLA at the Convention on Biological Diversity (CBD) in Cali, Colombia, October 21-November 1.

ASLA and its 16,000 member landscape architects, designers, and educators support the Kunming-Montreal Global Biodiversity Framework (GBF) and its key goals and targets. Landscape architects are committed to achieving the 2030 goals and targets, including protecting and restoring at least 30 percent of terrestrial, coastal, and marine ecosystems by 2030 (30 x 30). They also stand behind the Vision for 2050.

“We are advancing 30 x 30 through our projects, research, and advocacy. In our Climate Action Plan, we called for restoring ecosystems and increasing biodiversity on a global scale. This year in Colombia, we will show policymakers how to do it through the latest planning and design strategies,” said ASLA CEO Torey Carter-Conneen, Hon. ASLA.

“Landscape architects are key to translating policy into action and realizing real biodiversity gains in landscapes, particularly in cities,” said ASLA President Kona Gray, FASLA, PLA. “We are uniquely positioned to lead multidisciplinary teams of ecologists, biologists, engineers, and other disciplines to protect, restore, and enhance ecosystems worldwide.”

Landscape architects advance global biodiversity goals by:

  • Protecting and restoring ecosystems
  • Conserving habitat for species
  • Planting native trees and plants
  • Protecting and restoring soil health
  • Managing invasive species
  • Creating ecological corridors
  • Mitigating and adapting to climate change

They plan and design projects and conduct research at all scales in urban, suburban, and rural areas.

Dolores Pollinator Boulevard, San Franciso, California. BASE Landscape Architecture / Maria Duara
Dolores Pollinator Boulevard, San Franciso, California. BASE Landscape Architecture / Maria Duara

At the convention, Dr. Sohyun Park will present landscape architecture strategies to increase biodiversity at these events:

Biopolis 2024: Living Landscapes and Infrastructure for Healthy Communities, October 22-23, Green Zone. A keynote – Landscape Architecture Solutions to “Halt and Reverse” Biodiversity Loss – on October 22 at 8:50 AM COT.

Every Construction Project Is an Opportunity to Protect Biodiversity, October 26, 4-5 PM COT, Green Zone, Universidad ECCI Cali (Floor 7, Room 3). A session focused on “proven solutions to support nature that can be adopted at various scales of the built environment.”

MaFe Gonzalez will present these strategies at this event:

Cities to Blossom, October 25, 1 – 2.30 PM COT, Green Zone, Universidad ECCI Cali (Floor 1, Room 8). A workshop focused on “reconnecting children with urban biodiversity through the design of public spaces and educational institutions.”

Last month, ASLA released the results of its first national survey on landscape architects’ planning and design work focused on biodiversity. The survey found that 45 percent of landscape architects have prioritized biodiversity conservation and another 41 percent consider biodiversity part of their organization’s environmental ethos.

Earlier this year, the ASLA Fund released peer-reviewed research on landscape architecture solutions to the biodiversity crisis. The research, which Dr. Sohyun Park developed, reviewed nearly 70 peer-reviewed studies focused on planning and designing nature-based solutions to biodiversity loss published from 2000 to 2023. Explore the findings in an executive summary, which includes case studies and project examples, and a research study.

ASLA 2020 Professional General Design Honor Award. The Native Plant Garden at The New York Botanical Garden. Bronx, New York. OEHME, VAN SWEDEN | OvS / Ivo Vermeulen
ASLA 2020 Professional General Design Honor Award. The Native Plant Garden at The New York Botanical Garden. Bronx, New York. OEHME, VAN SWEDEN | OvS / Ivo Vermeulen

In 2022, ASLA urged world leaders to commit to ambitious global conservation and biodiversity goals, including 30 x 30. ASLA also joined 340 organizations worldwide in signing the Global Goal for Nature: Nature Positive by 2030.

Climate Positive Design Expands Pathfinder to Include Biodiversity, Equity, and More

Climate Positive Design

Buildings, landscapes, and infrastructure are responsible for more than 40 percent of global greenhouse gas emissions each year. Reducing the use of materials with high embodied carbon, like concrete, metals, and plastics, is key to bringing down those emissions.

Landscape architects who have used Climate Positive Design‘s Pathfinder know it’s a tool for calculating the carbon footprint of a landscape. It then helps designers figure out ways to reduce emissions from materials and increase carbon sequestration faster.

The new version of Pathfinder improves on those capabilities but also enables landscape architects and planners to do much more.

“We decided it’s time to deepen our carbon accounting and evaluate biodiversity, equity, cooling, and water conservation with the same rigor,” said Pamela Conrad, ASLA, founder of Climate Positive Design and ASLA’s inaugural Biodiversity and Climate Action Fellow.

Pathfinder 3.0 will help landscape architects achieve more of the resilience, equity, and biodiversity goals of the ASLA Climate Action Plan.

In terms of carbon, the new version “makes it easier to cut ‘business-as-usual’ emissions in half by 2040 and double sequestration,” Conrad said. This is because it now offers “more insights on lower-carbon materials and specific suggestions on how to improve your project’s impact.”

For biodiversity, the tool helps landscape architects track how well their design helps achieve 30 x 30. This refers to the target set by world leaders at the UN Convention on Biological Diversity COP last year that calls for all countries to protect 30 percent of land, coastal, and ocean ecosystems by 2030.

Pathfinder 3.0 helps landscape architects:

  • Identify the biome and eco-region of their project site
  • Determine how to best protect and enhance native tree and plant species
  • Create designs that increase biodiversity by at least 10 percent

“Pathfinder is not just helping users visualize their options. It’s also supporting innovation and creativity in transformative design,” said Colleen Mercer Clarke, an interdisciplinary scientist and landscape architect, who is special envoy to the International Union for the Conservation of Nature (IUCN) at the International Federation of Landscape Architects (IFLA).

Landscape architects can also now see how well their designs increase equitable outcomes by providing greater benefits to Justice 40 communities.

Pathfinder 3.0 aligns with the U.S. government’s Climate and Economic Justice Screening Tool (CEJST), which determines whether a project is in an underserved area. If the site is outside the U.S., a landscape architect can also identify the site as being in an underserved area based on CEJST criteria.

Want to know how much a design will cool a community? Pathfinder 3.0 shows how different design strategies will increase shade and reduce severe heat, as defined by the Trust for Public Land.

Climate Positive Design

In terms of water conservation, the tool now shows how to reduce water use through projects by 30 percent. It uses baseline data from the U.S. Environmental Protection Agency’s WaterSense.

Climate Positive Design undertook such an ambitious expansion because they see landscapes increasingly serving as critical infrastructure. With climate change and biodiversity loss, landscapes must do more for communities.

“Landscape architects are uniquely qualified to drawdown carbon, create healthier communities, and protect ecosystems through projects,” Conrad said.

“We have an opportunity and responsibility to address all of these elements through our work. But we also need to be able to measure those strategies and impacts.”

To calculate impacts from a wider range of materials and their transportation to sites, the new Pathfinder aligns with the datasets of Carbon Conscience, a tool that is used to cut emissions in the early concept phase. It is also now consistent with new industry standards being developed through the Embodied Carbon Harmonization and Optimization (ECHO) project.

Learn more about Pathfinder 3.0 and explore an updated user guide and methodology. Check out their design toolkit, which is based on the ASLA Climate Action Field Guide.

With Architecture 3030, Climate Positive Design also updated the 2030 Palette, a “visual database of sustainable design principles, strategies, tools and resources.”

There are new resources on:

  • Coastal seaforestration
  • Afforestation
  • Urban gardens
  • The 15-minute city
  • Regenerative peri-urban agriculture
  • Water-smart landscapes and systems

Also worth exploring: a comprehensive new guide to climate action planning and a decarbonization framework, which were also developed with Architecture 2030.

Decarbonization Framework for Planning, Landscape, and Infrastructure / Architecture 2030

New Guides for Landscape Architects Offer Practical Steps to Achieve Zero Emissions by 2040

Concrete was salvaged from a loading dock and repurposed within a Birch grove and gabion walls. The plants are native to the Piedmont Region. ASLA 2021 Professional General Design Honor Award. Atlanta Diaries, Atlanta, Georgia. Perkins&Will / Sahar Coston-Hardy

ASLA releases three new resources that cover how to decarbonize landscape architecture project specifications, the design process, and navigate environmental product data

ASLA has released a set of freely-available guides designed to help landscape architects, specifiers, and industry partners achieve the goals of the ASLA Climate Action Plan, which includes making the profession zero-emission by 2040.

The resources were developed by the ASLA Biodiversity and Climate Action Committee, a group of landscape architects charged with implementing key aspects of the plan, including how to decarbonize projects while increasing biodiversity. Landscape architects play an important role in designing nature-based solutions to climate change that also help communities become more resilient.

“Native plants and site boulders unearthed during construction anchor arroyo soils in place and reintroduce local character and ecology to the campus.” ASLA 2023 Professional General Design Honor Award. The University of Texas at El Paso, El Paso, Texas. Ten Eyck Landscape Architects / Adam Barbe

“These guides are the practical tools landscape architects have been asking for. They help turn every project into an opportunity to get on a path to zero emissions,” said ASLA CEO Torey Carter-Conneen. “They take our high-level goals and break it down for everyone – showing landscape architects and industry partners how to get there, step by step.”

“With climate impacts only worsening, we know we need to change how we design – and make that shift faster,” said April Phillips, FASLA, Chair of the ASLA Biodiversity and Climate Action Committee. “So we got to work, creating substantive how-to’s any landscape architect, specifier, or industry partner can pick up and start using today.”

New resources include:

Decarbonizing Specifications / ASLA; Featured image: Copley Square, Boston, MA / Sasaki

Decarbonizing Specifications
Guidelines for Landscape Architects, Specifiers, and Contractors

Developed by:
Chris Hardy, ASLA, PLA, Sasaki
Alejandra Hinojosa, Affil. ASLA, LPA Design Studios
Elizabeth Moskalenko, ASLA, PLA, Trustee, ASLA NY Chapter
Bryce Carnehl, Corporate ASLA, Hunter Industries

These guidelines make it easier for landscape architects to more effectively reduce greenhouse gas emissions from project design and construction. Sections cover seven key design principles and 18 areas of specification.

They are for landscape architects and designers, specifiers, contractors, and manufacturers who want to cut emissions and increase carbon storage and sequestration faster.

Decarbonizing the Design Process / ASLA; Featured image: ASLA 2016 ASLA Southern California Chapter Merit Award / Image courtesy of SWA Group, Jonnu Singleton

Decarbonizing the Design Process
A Phase by Phase Approach for Landscape Architects

Developed by:
Alejandra Hinojosa, Affil. ASLA, LPA Design Studios
Mariana Ricker, ASLA, SWA

This guide offers a phase-by-phase structure to decarbonize design through big ideas, strategies, and best practices. It is high-level, offering approaches that can be implemented regardless of project type, scope, and scale.

The guide offers decarbonization opportunities for:

  • Project kickoff
  • Schematic design
  • Design development
  • Construction documents
  • Construction administration
  • Operations and maintenance
Navigating Environmental Product Data / ASLA; Featured image: ASLA 2023 Professional GeneralDesign Honor Award. Grand Junction Park and Plaza. Westfield, Indiana. DAVID RUBIN Land Collective / Alan Karchmer

Navigating Environmental Product Data
A Guide for Landscape Architects, Specifiers, and Industry Partners

Developed by:
Amy Syverson-Shaffer, ASLA, Landscape Forms
Sasha Anemone, ASLA, Salt Landscape Architects

The products and materials that landscape architects specify for their projects play a significant role in the overall global warming potential (GWP) of a project. They can also impact biodiversity, air and water quality.

The guide outlines how environmental product declarations (EPDs) and other environmental reporting can be used to understand the environmental impacts of landscape materials and products and make decisions to reduce those impacts.

These new resources are what ASLA members and industry partners stated they needed in survey responses gathered over the past two years.

The guides are designed for the broad landscape architecture community, including:

  • Landscape architects
  • Landscape designers
  • Other specifiers
  • Industry partners that develop the products and services used in landscape architecture projects

The best practices in the guides can also inform the work of planners, architects, engineers, and urban designers.

The ASLA Climate Action Plan calls for all landscape architecture projects to achieve these goals by 2040:

  • Achieve zero embodied and operational emissions and increase carbon sequestration
  • Provide significant economic benefits in the form of measurable ecosystem services, health co-benefits, sequestration, and green jobs
  • Address climate injustices, empower communities, and increase equitable distribution of climate investments
  • Restore ecosystems and increase and protect biodiversity

26 CEOs of landscape architecture firms recently released a letter committing to the goals of the plan.

ASLA Advances Ambitious Set of Sustainable Conference Strategies

Minneapolis, Minnesota / Lane Pelovsky. Courtesy of Meet Minneapolis

The organization is focusing on transportation, energy, food, and waste to reduce greenhouse gas emissions – and new equity strategies to improve the positive legacy of the conference

ASLA has released its 2023 Sustainable Event Management Report, a comprehensive gap analysis of its 2023 Conference on Landscape Architecture, which brought more than 5,000 attendees to the LEED-certified Minneapolis Convention Center in Minneapolis, Minnesota, October 27-30, 2023.

The assessment details the energy used and greenhouse gas emissions and waste generated. It also outlines the many positive actions ASLA has taken to make access to the conference more equitable, donate EXPO products, reuse materials, and support the communities that host the conference.

Based on these findings, ASLA has advanced new event sustainability strategies that will improve the outcomes of its 2024 Conference, which will be held in Washington, D.C., October 6-9, and its 2025 Conference, which will be held in New Orleans, October 10-13, 2025. These include a communications campaign on the benefits of train travel for attendees and a new sustainability pledge for EXPO exhibitors.

“This year’s assessment taught us a lot about what it will take to achieve our ambitious Climate Action goals,” said ASLA CEO Torey Carter-Coneen. “We will need to continue to work as a collective – with the entire landscape architecture community – to decarbonize our conference. Our commitment to transparency and accountability continues to guide us.”

2023 Assessment

The assessment, which was developed in partnership with Honeycomb Strategies, a sustainability consulting company, includes key findings:

Over four days and per attendee, the conference released 0.68 metric tons of carbon dioxide emissions, which is 17 percent higher than the 2022 conference.

This is because:

  • The energy mix in Minneapolis, Minnesota included more fossil fuels than San Francisco, California, where the 2022 Conference was hosted.
  • ASLA collected additional transportation emissions data.
  • Updated methodology and calculations were used to align with the Net Zero Carbon Events Initiative. (See 2023 assessment for updated 2022 baseline data).

Due to procurement decisions made by ASLA and sustainability measures adopted by the organization:

  • 100 percent of electricity from the grid used by the conference was generated from off-site solar and wind through renewable energy credits. The credits were then retired.
  • 29,850 pounds of EXPO materials were donated to Habitat for Humanity, which is nearly 40 percent less than in 2022. This means exhibitors are leaving behind lower amounts of booth materials.
  • A waste diversion rate of 71 percent was achieved, which is 4 percent higher than 2022. Recycling increased by 700 percent and composting increased by 165 percent in comparison to 2022.
  • More than $43,000 in positive climate contributions were collected from ASLA members to purchase 1,225 offset credits, a 614 percent increase over 2022.
  • 475 pounds of food was donated to People Serving People.

Explore Key Findings

To reduce adverse climate and environmental impacts and leave a positive legacy in Minneapolis, ASLA has implemented these strategies for its 2024 Conference at the Washington, D.C. Convention Center:

  • Selected a host city with excellent train and public transit access and a LEED-Gold Convention Center.
  • Created climate change and biodiversity educational tracks.
  • Implemented a communications strategy to reduce transportation emissions from attendees and exhibitors traveling to and from the conference and in the host city. Preliminary data shows a 1,226 percent increase in train travel and a 24 percent decline in air travel to the 2024 Conference in comparison with the 2023 Conference (as of September 18, 2024).
  • Implemented a range of measures related to food, energy, water, and waste to reduce impacts.
  • Made a positive carbon contribution by purchasing up to 3,500 tons of emission offsets.
  • Enhanced a sustainability pledge for EXPO exhibitors.
  • Provided free registrations for invited Washington, D.C.-based climate equity and justice leaders to attend the conference.
  • Provided free registrations for invited Washington, D.C.-based young climate leaders to attend the conference.

See all conference and business operations commitments and progress to date at the Sustainable ASLA hub.

Positive Climate Contributions

While it pursues its near-term goal of reducing emissions 20 percent by 2024, ASLA has committed to purchasing up to 3,500 tons of carbon dioxide emission offsets from the National Indian Carbon Coalition (NICC).

Fond Du Lac Band Forest Carbon Project, Minnesota / © Stan Tekiela

This partnership will also advance the cultural empowerment and climate equity goals of the ASLA Climate Action Plan, which was released in 2022.

The carbon offsets NICC will provide have been generated in the Tribal Forests of the Fond du Lac Band of Lake Superior Chippewa in Minnesota. The Fond du Lac Band’s forest carbon project is a natural climate solution that generates carbon credits through Improved Forest Management.

Attendees and exhibitors: Please make a positive climate contribution at the ASLA 2024 Conference during the registration process or via this contribution form.

Next steps

By the end of 2024, ASLA will release a sustainability impact assessment of its ASLA Center on Landscape Architecture, the association’s LEED Platinum and WELL Gold-certified headquarters in Washington, D.C; student-led LABash Conference; and Landscape Architecture Magazine.

ASLA will use its own headquarters assessment to educate its members and partners on how to reduce their own office operational impacts and meet the goals of the ASLA Climate Action Plan.

By the end of 2024, ASLA plans to have a fuller understanding of its climate, environmental, and social impacts across the conference, EXPO, and headquarters operations.