Thanks for the link, I haven't read this before.

If crop yields fall 10% for every increase in global temperature of 1 degree, then we'll likely see a fortress America (even more so than it is now) in our lifetimes to hold North America's grain producing regions. If you think concentration camps as a response to Latin American immigration is bad now, then just wait a few decades until the US is gunning people down at every border who are trying to escape their too hot or famine environments.