that is true, but mainly because there are no water resources throughout. There are actual oasis in the sahara (though they are very few and far between) while it is not the lush depictions one would find from hollywood, the fawna can be quite diverse and thick. To me this proves that where there is fresh water, life will take root, even in a desert. Sure, it may take decades to make the land habitable for cropstuffs...but in the long run is seems like a no brainer, as it would (with enough towers) be able to produce an endless water supply and cheap, sustainable electricity.