Desal--- Science does that, and , AFAIK it's expensive for crops.

And.. it's incredibly energy intensive. The hotter the climate, the more heat we create making energy to cope with the heat. De-sal plants, air conditioned buildings and vehicles... it's a vicious circle.

Reducing consumption is the only hope, but nobody wants to give up their vaulted ceilings, monster SUVS and trucks, 105" color TVs, air conditioning, lawns. Builders continue to build mini-mansions with lush landscaping.

Transporting seasonal fresh produce back and forth between northern and southern continents.... astoundingly energy intensive. Transporting meat back and forth for processing between cheap labor continents and expensive labor continents.... incredibly energy intensive.

Poorguy is probably right. Doing all that stuff for an overpopulated planet while clutching pearls is simply rearranging deck chairs on the Titanic.