John Levine wrote:
Earlier this year I virtually sat in on a seminar series at the Yale forestry school about how you design forest carbon offsets and it became clear that you have to make some extremely optimistic assumptions.
Even with extremely optimistic assumptions, after Carboniferous period, forest is carbon neutral, because fungi have evolved to be wood-destroying releasing carbon stored in woods into the air, which terminated the Carboniferous period. Increasing forest area may increase deposited carbon in woods but is not practical or sustainable, especially because of population growth. Masataka Ohta
