The other issue is that not all climates are suitable for growing trees (at least with current methods and technology). Yes, human efforts can shift things a bit more in the forest direction but if there is no rain there will be no trees in the long term. And, unfortunately, due to carbon emissions, most of the earth is getting less suitable for trees, not more. Some of this greening the desert stuff relies on optimism that flies in the face of basic ecology.

I mean, it’s true that not all climates are suitable for growing trees, but the Sahel area’s climate is historically suitable for growing trees, and according to again some videos I recently watched, there are actually still trees in those areas, but they look like bushes because they’ve been cut down or pruned poorly. A lot of them can be repaired just through careful pruning.