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.

This statement makes no sense, it would be absolute stupidity to plant pine and eucalypts in Africa. You would plant indigenous and you would plant with a plan. So that it does not affect run-off and waterways. You can have grassland with trees. This is not difficult.