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I know China has done a lot of “regreening” of areas and I’ve read that the Sinai could be a good candidate for the same sort of restoration. It’s not my area of expertise but the best candidates seem to be areas that are deserts because of human activity (like over farming, excessive water use, etc.).
What China did was plant trees, restore nutrients to the soil, add terraces to hills, limit livestock, and other things that slow down water loss. They successfully regreened and area the size of France but I think, crucially, it got enough water naturally. The land was just depleted, which caused the water to wash away topsoil instead of support vegetation.
So, I don’t think we could realistically show up to an arid desert and turn it into much. But there’s places we think of as desert now that would be good candidates for restoration.