While nuclear energy is also in problems as I pointed out a few weeks ago. Especially since peak Uranium is a thing just as peak oil. Plus large parts of the world evidently aren't allowed to have nuclear reactors (just in the case you haven't noticed the topic over the years). Therefore those parts of the world will just continue to burn fossil energy. Not to mention that most of the world can't even afford nuclear energy.
Plus world's population is still growing and thus you will have to clear additional forests in order to avoid direct social and regional instability. However since crops tent to weight much less than forest trees with this replacement you are basically adding new carbon into the system. Since there is large difference in organic mass that has to go somewhere. Therefore even if we cut fossil fuel energy to zero we will still create plenty of new carbon in the atmosphere. Not to mention that large drought driven forest fires around the globe are also directly adding plenty of new carbon into the atmosphere. The carbon that no one is adding into the equation because it isn't direct product of fossil energy. This carbon is hard to "define" and thus tax, so it isn't "socially interesting". But it is evidently there in a physical sense. I mean do you realize how large carbon extraction infrastructure would have to be to compensate things at this scale ?
Etc. etc.
Therefore I think that we are coming to the point where we simply have to admit it to ourselves that we are in dead end street. Not a comforting thought but if you go deep enough that is the most logical conclusion.
I hear you. But one never knows. I mean, peak oil turned out to be pretty much a nothing burger due to fracking and other new oil extraction tech. I don't really know much about carbon extraction tech, but who knows. Imagine, for example, a massive carbon extraction plant housed in Antarctica/North Pole powered by nuclear reactors. Sure it takes energy, and right now, nuclear is the only non-carbon energy dense tech on the go.
What I suggest might be completely impractical. I'm just brainstorming. But as far as I can tell, moving off fossil fuels given human nature/economic reality is equally impractical. And real world data seems to support that. So humanity needs to think outside the box.
Human kind is absolutely pathetic when it comes to long term planning and widespread cooperation. Everything falls apart when short term expediency (i.e. winning the next election) comes up. However, humanity has in the past, proven very inventive when an actual threat is looming in the near term.
I think if global warming doomsday is as near or as dire as the media likes to play it up as (the media has always got fear factor dialed up to 10) humanity is hooped. I'm not sure it will be, but I'll probably be dead before the truth is really known.
I can clearly recall (cuz I'm kinda old) back in 1997 (Kyoto protocol) the standard mantra was: if we don't get our shit together by 2025 we're screwed. With 2025 just around the corner, the new mantra is: if we don't get our shit together by 2050 we're screwed. I imagine in 2050 the can will get kicked down the road to 2075. Either that, or we will have experienced the predicted doom, or new science will mean we found a way to dodge the bullet.