Lots of unused land are shrubs, grass and hillsides. The mediterranean coast used to be all trees a little more than two millenia ago[0]. Some semi-arid zones a

Lots of unused land are shrubs, grass and hillsides. The mediterranean coast used to be all trees a little more than two millenia ago[0]. Some semi-arid zones around deserts could also support reforestation. [0] https://en.wikipedia.org/wiki/Deforestation_during_the_Roman_period https://en.wikipedia.org/wiki/Deforestation_during_the_Roman...