[youthfulbacon]

Very true on historical predictive accuracy. I can not back the claim that the carrying capacity of the earth will substantially decrease in a warmer climate. From what I have read, changes in local weather patterns have caused reductions in local food security in recent and ancient history and these triggered significant upheaval (even without the presence of mass starvation).

Based on recent research, a warming climate has the potential to reshape the availability of arable land.

My concerns are primarily around upheaval (seems likely in most scenarios), potentially needing to divert more resources to food acquisition (seems unlikely in the long term as you note), and a coincident reduction in perceived value of nature preserves (a selfish concern from my love of wildlife).