I guess we can assume that the executives at the big AI companies don't believe in man made climate change.

Climate change is a lot less important when you are rich enough that it doesn't impact you personally, and when you don't care about what the world looks like after you die.

Sure, millions of people are going to die due to climate change, and that's going to impact the company's profitability, but by then your stock options will have already vested - so that's a problem for someone else!

A(G)I is supposed to fix everything so nothing matters /s

Why is this sarcastic? Isn't this a plausible possibility?

Given that everything important has trade-offs, no, AI, even if it were very very smart wouldn’t be able to “fix everything”