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Some scientists are convinced that the world's climate is getting colder every year, threatening a return to the conditions of the last ice age, which reached its peak about 18,000 years ago.
Since 1940 temperature has been dropping. According to a survey by the National Oceanic and Atomospheric Administration, the average ground readings for the Northern Hemisphere have, in the years from 1945 to 1968, fallen by one-half degree F. In the United States, east of the Continental Divide, temperatures in the last decade averaged one to four degrees cooler than in the past 30 years. Another study by the same agency noted that the amount of sunshine reaching the ground in the United States decreased by 1.3% between 1964 and 1972.