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Line 25: − Even major peer-reviewed journals have engaged in [[policitized science]]: − − :"In the spring of 1989 I prepared a critique of global warming, which I submitted to ''Science'', a magazine of the American Association for the Advancement of Science. The paper was rejected without review as being of no interest to the readership." [http://www.cato.org/pubs/regulation/regv15n2/reg15n2g.html]
restore Goddard estimate - which is the highest
[[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><ref>Jones, P. D., M. New, D. E. Parker, S. Martin, and I. G. Rigor (1999), Surface air temperature and its changes over the past 150 years, Rev. Geophys., 37(2), 173–200.</ref>, and scientists say 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 gas]]es 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.
Hansen's group at the Goddard Institute wrote, "Global warming is now 0.6°C in the past three decades and 0.8°C in the past century." [http://data.giss.nasa.gov/gistemp/2005/]
==Natural variability of the climate system==
==Natural variability of the climate system==
==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.
Several prominent scientists have pointed out the [[politicized science]] of the UN's assessment methods. The scientific reports are submitted to a panel of representatives appointed by each country in the IPCC. Several scientists have complained about their work being misrepresented by the U.N.
Several prominent scientists have pointed out the [[politicized science]] of the UN's assessment methods. The scientific reports are submitted to a panel of representatives appointed by each country in the IPCC. Several scientists have complained about their work being misrepresented by the U.N.
==Notes==
==Notes==
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