I just got back from a 2 week trip to namibia with my family. It was stunning, the landscapes beautiful and extreme. We travelled most of the time with a group of 16 in a Safari truck. I was amazed that 9 of the 10 campsites not only had running water but showers and toilets! It was so dry there, you wonder how a well of any depth could find any at all.
When you look out from the dunes to the sea, with the warm bright sun ahead and massive amount of space behind you (Namibia has only two million people and is one of the least densely populated in the world), you wonder whether you couldn't just engineer sun, water and land to work together and become more biologically productive.
On my return my brother sent me this link - you HAVE to see it - its AMAZING and looks like it is taking off!!