That's a great point! Biden did finally take something resembling urgent action on climate change, which is the first time a US president has ever done that. He tried for a lot more, but what he was actually able to get through the congress (which took quite a bit of doing) was putting the US on track for a 40% reduction in emissions by 2030.

It's a super relevant part of his record, and increases by a significant amount the chance that we'll get to continue to exist on the earth in 100 years (although there's about 10 times more work that is needed and even than it's not certain). With as little time as we have left (basically, none), Trump would be an existential catastrophe to the entire human race, and would be even if his opponent wasn't actually accomplishing an unprecedented level of progress on the issue.

It's a good point, and I'm glad you brought it up.