Thanks, Google maps is a great idea. Is there a list of these locations with historical images? The approaches you mention are basically what I'd expect: mass-

Thanks, Google maps is a great idea. Is there a list of these locations with historical images? The approaches you mention are basically what I'd expect: mass-scale efforts that are hit and miss but will overall result in large effects. I suppose the end goal is different between this and other groups: one is "we need trees, lets plant trees" the other is "we need trees but we also need to repair our relationship with nature and create sustainable projects", and the latter probably has scaling-problems built-in. I assume there's a lot of unrelated problems doing that in Africa, but North America has deserts too. What's keeping tech-loving tinkerers with a passion for drones and robots from transforming Arizona?