How to Grow Food in the Middle of a Desert Using Seawater

As conventional sources of clean water dry up, we're looking ever farther, wider, and deeper. In a long feature on unusual sources of water, Nature leads us somewhere especially unexpected—into the middle of a desert. The Sahara Forest Project wants to prove we can green the desert, turning barren land into oases of… » 6/17/14 8:20pm 6/17/14 8:20pm