It's much more complicated than that. Weather patterns will shift dramatically, meaning that our current locations for growing food (for the world) will change.

It's much more complicated than that. Weather patterns will shift dramatically, meaning that our current locations for growing food (for the world) will change. Natural resources by country will shift immensely. There will likely be significant turmoil to sort all this out, with of course the possibility that many will die due to unexpected weather (see Sandy: hundreds dead despite near-perfect short-term weather prediction), food shortages, etc. Someone more qualified will hopefully answer you - but I can say for sure that your understanding of the potential consequences is so simplified as to be wildly incorrect.