We won’t act fast until a percentage of deniers, capitalists, oligarchs, shareholders are personally affected by climate change. Could be just a significant dip in the markets or a globally catastrophic famine. But until they directly feel the pain they will fight with all their resources against making any changes at all.
Narrator: We won't act fast, because the ruling class doesn't care.
mostly wealthier humans could be responsible for the deaths of one billion mostly poorer humans
Framing it that way will only excite those wealthier humans.
Having a plan which can be legally enforced would be a solid place to start.
"Do nothing lol" is still a choice, one you are implying you'd make because
With luck, it'll eventually get all the apemen. Time to let evolution pick our successors. Humanity is a dead-end.