I don't think you need to make the whole planet a forest for this to be feasible. Yes we use a lot of carbon, but not THAT much carbon. It would mess with some

I don't think you need to make the whole planet a forest for this to be feasible. Yes we use a lot of carbon, but not THAT much carbon. It would mess with some ecosystems (obviously), which is not ideal, but it wouldn't be that drastic of an alteration to the planet as a whole. Also, the claim wasn't that this is perfect. Just that it's be (much) better than what we're doing currently.