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Greenhouse effect - reference list

1) IPCC, 2007: Historical Overview of Climate Change. In: Climate Change 2007: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change http://www.ipcc.ch/pdf/assessment-report/ar4/wg1/ar4-wg1-chapter1.pdf

2) National Oceanic and Atmospheric Administration.  2007.  Global Warming: Frequently Asked Questions.  http://www.ncdc.noaa.gov/oa/climate/globalwarming.html