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2. The IPCC is the scientific body tasked with evaluating the risk of climate change caused by human activity the scientific basis for climate change and the mitigation options.
3. NASA Earth Observatory [website]. Greenbelt MD:NASA Earth Observatory EOS Project Science Office National Aeronautics and Space Administration (acquired 7 Feb 2010). Available: http://earthobservatory.nasa.gov/IOTD/view.php?id=42568 [accessed 2 Dec 2011].
4. Relative increase of record high maximum temperatures compared to record low minimum temperatures in the U.S.