I’m looking for someone to review a couple of informal papers that I wrote. I would be happy to pay for some decent criticism! You will need some math. Here’s a link to the first one, about the causes of CO2 accumulation and global warming:
In summary, the 50% of Earth’s forests that have been destroyed by people, and the grassland that has become desert, might have absorbed 21.5 GT / year of CO2 (in addition to what is absorbed by that land now). This is more than the 13 GT / year of CO2 that is accumulating due to human emissions.
The remaining forests are able to absorb 1/2 of current human CO2 emissions. The forests and other lands we have destroyed, if restored, would be able to absorb all our emissions and an additional 30% more CO2. If we stopped 50% or more of our emissions, the remaining forests would cope.