Global Cooling was a Scientific theory in the 1970's that claimed that we would soon dive into another Ice Age due to extreme temperature patterns favoring cooler days, and that it would be preceded by and made manifest by a dire food shortage that covered the entire Earth.
"Predictions of global cooling never approached the kind of widespread scientific consensus that supports the greenhouse effect today. And for good reason: the tools scientists have at their disposal now—vastly more data, incomparably faster computers and infinitely more sophisticated mathematical models—render any forecasts from 1975 as inoperative as the predictions being made around the same time about the inevitable triumph of communism."
~ William Connolley, a climate scientist at the British Antarctic Survey who has made a hobby of studying ice age predictions.

The scientific methods that we now have are much more accurate and dependable than they were 35 years ago. Global Warming is a real phenomenon and needs our immediate attention and action.