Reply #12: Historically, people migrated. But today there's nowhere to go.

[phantom power]

We're at a sort of unprecedented point in history. We've substantially filled up the habitable area of earth.

Suppose that this ongoing drought in the southwest continues for another 10 years. Happens all the time, geologically speaking. The previous times it happened, people packed up and left (or some of them starved, I suppose). But now there are tens of millions of people living here. I wonder what the plan-B is? Show up on the doorstep of the "great-lakes" states, and get hi-paying managerial jobs at the local Big-Boy?