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→Politics of Global Warming
However, Ruddiman states that sun-spot activity could only explain one tenth to half of the temperature increase observed over the past century. <ref> Ruddiman (2000) Earth's Climate: Past and Future. W.H. Freeman and Company, New York</ref>
However, Ruddiman states that sun-spot activity could only explain one tenth to half of the temperature increase observed over the past century. <ref> Ruddiman (2000) Earth's Climate: Past and Future. W.H. Freeman and Company, New York</ref>
The natural orbital cycles which affect the amount of solar radiation reaching the earth's surface occur in cycles that at their shortest are at least 10,000 years long. As such these cycles alone are far too slow-acting to explain the temperature change observed in the past century and at best could explain only a tiny fraction of it. In fact, some of the cycles are at such a stage presently that they should be reducing the level of solar radiation reaching the earth and as such would be lowering temperatures.
Richard S. Courtney, a U.N. Intergovernmental Panel on Climate Change (IPCC) expert reviewer and a U.K.-based climate and atmospheric science consultant says "Rubbish! Global warming is not 'accelerating," and "...that anybody who proclaims that 'Global warming is accelerating' is a liar, a fool, or both." <ref>[http://www.newsmax.com/brennan/global_warming_debunked/2008/12/16/162489.html Global Warming’s Last Gasp] NewsMax, December 17, 2008</ref>
Richard S. Courtney, a U.N. Intergovernmental Panel on Climate Change (IPCC) expert reviewer and a U.K.-based climate and atmospheric science consultant says "Rubbish! Global warming is not 'accelerating," and "...that anybody who proclaims that 'Global warming is accelerating' is a liar, a fool, or both." <ref>[http://www.newsmax.com/brennan/global_warming_debunked/2008/12/16/162489.html Global Warming’s Last Gasp] NewsMax, December 17, 2008</ref>