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The last time carbon dioxide concentrations were around 400ppm: a snapshot from Arctic Siberia
rdaneelolivaw 2013/05/20
The meaning of 400ppm.

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Global carbon dioxide in atmosphere passes milestone level
rdaneelolivaw 2013/05/15
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Data Visualization - NOAA Global Monitoring Laboratory
rdaneelolivaw 2013/05/15
Carbon Cycle Gases - Mauna Loa, Hawaii, United States, Time Series.

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Trends in CO2 - NOAA Global Monitoring Laboratory
Official websites use .gov A .gov website belongs to an official government organization in the United States. Secure .gov websites use HTTPS A lock () or https:// means youâ€™ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
rdaneelolivaw 2013/05/15
Up-to-date weekly average CO2 at Mauna Loa.

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https://wwf.panda.org/wwf_news/?208477/Climate-Change-milestone-demands-shift-to-renewable-energy
rdaneelolivaw 2013/05/03
If reaching 400ppm doesn't qualify for a "wake-up" call, our future is doomed. It is high time.

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Keeling Curve Website Wants You To Know When CO2 Levels Hit 400 Parts Per Million | ThinkProgress
rdaneelolivaw 2013/04/29
On April 22nd, "Hawaiiâ€™s Mauna Loa Observatory measured CO2 levels in the air of 398.36 parts per million (ppm). "

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