The wheat growing region is also moving north (see map at bottom.) By 2050, the wheat growing zone will be almost entirely in Canada. Except much of that is tundra, and may not even support wheat. Double yikes.
Warmer zones in the U.S. directly affects crop production.
Loss of cropland means economic turmoil, which in turn will have major political impact. That will be a major theme here at Polizeros this year – the political ramifications of global warming.
All of this is clear proof that global warming is happening. Rather than quibble over whether it is human-induced, caused by long-term physical cycles, or a combination of both, we need to act now.