Bill Gates and Elon Musk are at it again, taking aim at each other over climate change.

Gates and Musk have a well-established history of taking jabs at each other over a variety of topics. The last round was instigated by Gates in an interview with a French news outlet, in which he said he donates more to climate change efforts than Musk.

“Tesla’s done a fantastic job; I give a lot more money to climate change than @elonmusk or anyone else,” Gates said. “He’s (Elon) done a great job, but somebody shorting the stock doesn’t slow him down or hurt him in any way.”

Musk’s reply was short and sweet:

“Sigh”

— Elon Musk (@elonmusk), June 4, 2022