Anther thing is that by planting trees you increase the oxygen level and will cause fires that way, but also oxygen will cause a temperature drop.
As far as I know all green does this, probably planting grass on baren land will cause as much progres as trees would.
I think the most important job for us humans is to create alternatives for growing crops so that we can stop depleting our top soils and stop injecting fertilizers and poisons and give these top soils back to the green stuff that will cool down the planet a bit.
