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Modified introductory paragraph to include reference to the IPCC's recent report.
'''Global warming''' is the term ascribed to an increase in global average surface temperature.
'''Global warming''' is the term ascribed to an increase in global average surface temperature.
Scientists such as [[Richard Lindzen]], [[Fred Singer]], etc., say that the patterns of global warming are naturally caused. Some other scientists like [[James Hansen]] and [[Michael Mann]] say that the [[Modern Warming Period]] is largely caused by human activity.
Scientists such as [[Richard Lindzen]] and [[Fred Singer]] say that the patterns of global warming are naturally caused. In February, 2007, the [[Intergovernmental Panel on Climate Change]], an international group of scientists established by the [[United Nations]], released their fourth assessment report on climate change. They concluded that recent global climate change was "very likely" caused by human activity.<ref>http://news.bbc.co.uk/2/hi/science/nature/6321351.stm</ref>
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 gas]]es and air temperature.