Irrigate the world
suck pure water out of the sea Use O level physics! You would taught in high school. Just one metre of vacuum, will cause report may even see water to boil into pure water vapour. Losing all salts and contaminants! The be all biological life forms behind. The water vapour is then 1000 times easier to pump and liquid water. So you get a little 20 kW solar panel. And converts the sea or river water, to form water minister over a tank or reservoir half a kilometre away! We can then established snorkels, to pump the water as vapour further inshore! The pumping is almost free! So around Arabia, we can pump 10,000 metres of water as mist, half a kilometre inshore - every minute! Groups of farmers can band together, to set up a vacuum desalination plant, and irrigate what today is our ears and lifeless desert land. We do need to dredge up the seabed, and was so salt out in sturaries, and then produce soil maps impregnated with gras...