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

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