Remember global cooling?(Snapshots)

A cooling trend beginning in about 1940 caused a "global cooling" scare in the 1970s. Today, of course, the environmental Chicken Littles who fretted about a coming ice age now warn against catastrophic global warming.

[I]t is projected that man's potential to pollute will increase six-to eightfold in the next 50 years. If this increased rate of injection of particulate matter in the atmosphere should raise the present global background opacity by a factor of 4, our calculations suggest a decrease in global temperature by as much as 3.5[degrees]K [3.5[degrees]C]. Such a large decrease in the average surface temperature of the Earth, sustained over a period of a few years, is believed to be sufficient to trigger an ice age.

--Science, "Atmospheric Carbon Dioxide and Aerosols: Effects of Large Increases on Global Climate," July 9, 1971

Climatologists now blame those recurring droughts and floods on a global cooling trend. It could bring massive tragedies for mankind.

--Fortune, "Ominous Changes in the World's Weather," February 1974

However widely the weather varies from place to place and time to time, when meteorologists take an average of temperatures around the globe they find that the atmosphere has been growing gradually cooler for the past three decades. The trend shows no indication of reversing....

Since the 1940s the mean global temperature has dropped about 2.7[degrees]F. Although that figure is at best an estimate, it is supported by other convincing data. When Climatologist George J. Kukla of Columbia University's Lamont-Doherty Geological Observatory and his wife Helena analyzed satellite weather data for the Northern Hemisphere, they found that the area of the ice and snow cover had suddenly increased by 12% in 1971 and the increase has persisted ever since. Areas of Baffin Island in the Canadian Arctic, for example, were once totally free of any snow in summer; now they are covered year round.