Climate explained: how much of the world’s energy comes from fossil fuels and could we replace it all with renewables?

How are fossil fuels formed, why do they release carbon dioxide and how much of the world’s energy do they provide? And what are the renewable energy sources that could replace fossil fuels?


This is a companion discussion topic for the original entry at https://sciblogs.co.nz/planetary-ecology/2021/09/15/climate-explained-how-much-of-the-worlds-energy-comes-from-fossil-fuels-and-could-we-replace-it-all-with-renewables/