References

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http://www.wmo.ch/meteoworld/en/en/gcs.htm.

National Climatic Data Center. (2007). Global warming. Retrieved April 5, 2007 from

http://www.ncdc.noaa.gov/oa/climate/globalwarming.html.

U.S. Environmental Protection Agency.(2007). Climate change. Retrieved April 5, 2007 from

http://www.epa.gov/climatechange.html.