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There are ominous signs that the earth's weather patterns have begun to change dramatically and that these changes may portend a drastic decline in food production--with serious political implications for just about every nation on earth. The drop in food production could begin quite soon... The evidence in support of these predictions has now begun to accumulate so massively that meteorologist are hard-pressed to keep up with it.
--Newsweek, April 28, (1975)

Interestingly enough, there may indeed be a drastic decline in production of certain types of food. But it would be due to conversion of corn and other crops to ethanol to power our cars. Ethanol is a false fuel. It has less btu per gallon than does gasoline and the energy used to make it, if you include costs of pumping water for irrigation for example, make it uneconomical except for the tax subsidies. And, of course, using corn for fuel prevents its use as a human food source as well as feed for cows, pigs and chickens which provide us with our meat.