Dirty energy isn't the (main) problem; intensive agriculture and aggressive fishing is the main problem.

Humans need to eat less meat and fish. Much less. Like, in rich countries, at least 95% less.

It might be marginally beneficial but it's not an effective way to combat climate change. Something else is needed to stop USA, Saudis, China and Russia from digging up the cheap oil and coal. And to stop everyone from doing all the wasteful and co2-increasing things with agriculture and deforestation etc.

We need intergovernmental coordination and limits on market forces much more than we need an energy MacGuffin.