Reforesting without planting trees by encouraging shrubs to grow by pruning them (which are really trees with too many branches to grow tall): https://www.youtube.com/watch?v=RBP2uRQk5pQ
Increasing water retention and underground storage by building simple rock dams: https://www.youtube.com/watch?v=c2tYI7jUdU0
Creating forests quickly with the Miyawaki method: https://www.youtube.com/watch?v=y9c_Zlmqcgw
The solutions are there and rely on accelerating positive natural processes. But they don't funnel public money into private pockets, so let's fund harebrained schemes instead.