Climate and energy: A scenario to a 21st century problem

The energy contribution of anthropogenic climatic fluctuations has been estimated to a gain of 15–20 TW, in comparison with a gain or deficit of 100–300 TW from natural processes responsible for the observed climatic fluctuations of the last 200 years. A dominant role of an increase of CO2 by a factor 2–5 in the next century, accompanied by side effects acting in the same direction, seems to be most likely. Under the assumption of constant natural factors anthropogenic warming and its effects on the Arctic sea-ice may successively lead to climatic states as in 1931–60, in the early Middle Age (900–1200) and in the climatic optimum period ca. 5000 BP. Finally it may result in a complete destruction of the Arctic sea-ice with a drastic shift of all climatic belts towards north, extending even to the interior Tropics.

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