Would it be possible to mass produce the world’s largest most efficient water desalination plant and strategically place them all over the world and have them pump the desalinated water inland to cities, farms, etc.?
This could provide drinking water to billions, reverse the effects of desertification and possibly even lower rising ocean levels. By mass producing them they could be much cheaper and have all of the replacement parts warehoused for easy long term maintenance. If 70% of the water used in the world is for irrigation, this would mean cheaper water for farmers, increased number of acres of arable farmland, and higher yields, resulting in lower food costs. Who could undertake such a massive project? The UN? Unicef?