Musk Believes in Global Warming. Trump Doesn’t. Will That Change?

Elon Musk has described himself as “pro-environment” and “super pro climate.” But he also threw himself wholeheartedly into electing as president someone who has dismissed global warming as a hoax.

Now, as President-elect Donald J. Trump prepares to enter the White House, one big question is how much sway — if any — Mr. Musk’s views on climate change and clean energy might have in the new administration.

During the campaign, Mr. Trump noticeably softened his rhetoric on electric vehicles as he grew more friendly with Mr. Musk, the billionaire chief executive of Tesla. After months of bashing plug-in cars and promising to halt their sales, Mr. Trump backtracked slightly this summer.

“I’m constantly talking about electric vehicles, but I don’t mean I’m against them. I’m totally for them,” he told a crowd in Michigan. “I’ve driven them and they are incredible, but they’re not for everybody.”

At the time, Mr. Musk claimed credit for Mr. Trump’s apparent shift, telling Tesla shareholders at a June meeting, “I can be persuasive.” Referring to Mr. Trump, he said, “A lot of his friends now have Teslas, and they all love it. And he’s a huge fan of the Cybertruck. So I think those may be contributing factors.”

Now Mr. Musk, who spent election night at Mr. Trump’s Mar-a-Lago residence and posed for a group photograph with the president-elect’s family, is expected to have a direct line to the White House in the coming months. Mr. Musk’s companies, including Tesla and SpaceX, already make billions from government contracts and federal policies, and he is expected to seek additional advantages for his businesses.