Elon Musk and President Donald Trump — two of the most powerful, outspoken billionaires in America — are still tangled up in a messy breakup over a variety of issues. It’s no shock that these two men with huge egos would have friction, but it’s interesting to look at some of the specific things that seem to be causing trouble between them.

In particular, Trump’s and Musk’s differing views on climate change and clean energy have evidently become an irritant again. Recall that Musk, CEO of the electric car company Tesla, participated in White House councils during Trump’s first term, but left after Trump began the process of pulling the US out of the Paris climate agreement.

But Musk began to drift to the political right. He publicly backed Trump’s campaign for a second term — onstage and with money — and was rewarded with a high-profile quasi-governmental post as the head of the new Department of Government Efficiency that laid off thousands of federal workers. It seemed like they were accomplishing their mutual goals. Trump even turned the White House into a

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