![]() ![]() The climate at any one time is affected by several factors which can act independently or together. That drop in temperature came after what was described in the National Geographic as 'six decades of abnormal warmth'." ( James Schlesinger) Yet the concentration of greenhouse gases was measurably higher in that later period than in the former. It was followed by the aforementioned cooling trend from 1940 to around 1975. "Of the rise in temperature during the 20th century, the bulk occurred from 1900 to 1940.
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