Submarines have had, for decades, such a device, it is about the size of a dorm fridge, only deeper front to back. Works like a charm for unlimited amounts of time. Works on electricity (on subs, from electricity produced by the reactor, of course) & produces plenty of cooking & drinking for the entire crew.

So then the next wars can be fought over energy. remember, Enron?

@AnneWimsey But not enough to supply the demands of agriculture.

@Petter most plants can tolerate a bit of salinity. And perhaps farms could move to areas more friendly to the crop being grown...when has it Ever made sense to grow lettuce in the hottest part of Arizona, for example?

@AnneWimsey "a little bit of salinity" doesn't make much sense. Most water is in either a fresh or a saline state. What about farm animals? What about massive fields of essential crops? Without irrigation the world's food supplies would halve - and there is already starvation.

But it is still our own fault.