It's not as crazy as it sounds. About 80% of continental rainfall is caused by trees recycling fallen rain water in the soil back up into the atmosphere. http:/

It's not as crazy as it sounds. About 80% of continental rainfall is caused by trees recycling fallen rain water in the soil back up into the atmosphere. http://www.nature.com/articles/nature11983 http://www.nature.com/articles/nature11983 Obviously the specifics of the implementation depends on local geography and hydrology, but re-planting trees is pretty much the only economically/thermodynamically plausible way to "bring back rains" (eg desalination is way too expensive). So yeah, they're actually onto something.