Billions of dollars have been spent undermining science and electing corrupt fascists because people with control of fossil fuel wealth didn't want to deal with reality and laws and democracy.
That may well kill more people than climate change. Hard to tell as both have the potential to spiral out into a variety of intertwining tragedies.
If the human part of climate change wasn’t true and the fossil fuel industry’s wasn’t the culprit it would’ve been proven by now. It is very unlikely that the fossil fuel industry that is so rich and powerful wouldn’t have proven it by now.