It is projected that man's potential to pollute will increase 6 to 8-fold in the next 50 years. If this increased rate of injection[...] should raise the present background opacity by a factor of 4, our calculations suggest a decrease in global temperature by as much as 3.5℃. Such a large decrease in the average temperature of Earth, sustained over a period of few years, is believed to be sufficient to trigger an ice age.
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