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[[Image:Rogerrevelle.jpg|thumb|right|200px|[[Roger Revelle]]]]
[[Image:Rogerrevelle.jpg|thumb|right|200px|[[Roger Revelle]]]]
'''Global warming''' is the term ascribed to an increase in global average surface temperature. The global average surface temperature warmed about 0.8 K during the last century <ref>[http://data.giss.nasa.gov/gistemp/2005/ GISS Surface Temperature Analysis]</ref>, and to most scientists the warming is caused by increases in carbon dioxide and other greenhouse gases in the atmosphere.<ref>[http://www.sciencemag.org/cgi/reprint/306/5702/1686.pdf The Scientific Consensus on Climate Change]</ref> The possibility of adverse consequences has become a major concern for environmentalists. Some scientists such as [[Richard Lindzen]], [[Fred Singer]], etc., say that the patterns of global warming are naturally caused.
'''Global warming''' is the term ascribed to an increase in global average surface temperature.
Independent scientists such as [[Richard Lindzen]], [[Fred Singer]], etc., say that the patterns of global warming are naturally caused.
Politicians who support the [[Kyoto Protocol]] have made the claim that there is a cause and effect relationship between increases in atmospheric concentrations of [[greenhouse gases]] and air temperature.
Politicians who support the [[Kyoto Protocol]] have made the claim that there is a cause and effect relationship between increases in atmospheric concentrations of [[greenhouse gases]] and air temperature.
==Politics of global warming==
==Politics of global warming==
The global average surface temperature warmed about 0.5 C over the second half of the 20th Century,{{Fact-science}} and to some the warming appears to be related to increases in carbon dioxide and other greenhouse gases. The possibility of adverse consequences has become a major concern for environmentalists.
Assessments of climate science by the United Nations (see [[IPCC]] - ''Intergovernmental Panel on Climate Change'')
Assessments of climate science by the United Nations (see [[IPCC]] - ''Intergovernmental Panel on Climate Change'')
have claimed that scientists are 90% sure that over 50% of the observed global warming in recent decades is human-caused, and that continued global warming should be expected over at lease the next century.
have claimed that scientists are 90% sure that over 50% of the observed global warming in recent decades is human-caused, and that continued global warming should be expected over at lease the next century.