| http://www.w3.org/ns/prov#value | - But this is a cyclical variation and comparisons with results from earlier spacecraft show no overall increase since the 1980s.The relatively small variations in the Sun??s brightness observed by satellites encouraged the Intergovernmental Panel on Climate Change to propose in 1990 that global warming in the 20th Century was due mainly to carbon dioxide and other heat-trapping greenhouse gases add
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