Water, Water Everywhere?

I recently received a response back from someone regarding my LinkedIn comment about how Marc Reisner opined in his book Cadillac Desert that there really shouldn't be any agriculture west of a certain longitude that crossed through, I think, western Kansas. Reisner's argument was that west of that line, all agriculture requires irrigation and is unsustainable over time.

The commenter, from farming country, asked me what I would recommend be done to keep agriculture and livestock production going to feed people in the absence of irrigation. I responded I was offering an observation, not an opinion. I noted that the world's water supply is not infinite. I asked his opinion on what we should do to feed an ever-increasing population when there is a fixed amount of available water to sustain agricultural production.

I haven't heard back.

Any opinions?

Lake Mead, January 31, 2021