Quote:
Originally Posted by ogon_bat
UN warns of looming worldwide food crisis in 2013.
World grain reserves are so dangerously low that severe weather in the United States or other food-exporting countries could trigger a major hunger crisis next year, the United Nations has warned.
... and lets not forget that the USA has already experienced a year without summer.
So the zombie apocalypse might be closer than we think, only it will not be zombie stricken neighbor the one wanting to chew you out 
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Stable weather patterns are essential to crop production. Also, once a region is thoroughly established for crop growing -- it can be difficult/impossible to uproot and follow the "safe zones" around if they move too frequently.
Oopsie .... :P