Climate Change Lesson 6 : Evidence of Change
Intergovernmental Panel on Climate Change (IPCC). (2007). IPCC Reports. Retrieved January 17, 2013, from http://www.ipcc.ch/publications_and_data/publications_and_data.shtml
NOAA. Retrieved January 17, 2013: Trends in Atmospheric Carbon Dioxide from http://www.esrl.noaa.gov/gmd/ccgg/trends/ http://www.esrl.noaa.gov/gmd/ccgg/trends/history.html and Vostok Ice Core Data from http://www.ncdc.noaa.gov/paleo/icecore/antarctica/vostok/vostok_data.html
United States Global Change Research Program. Retrieved January 17, 2013 from http://www.globalchange.gov/
Carbon Dioxide Information Analysis Center, Oak Ridge National Laboratory. http://cdiac.ornl.gov/trends/co2/vostok.html (student activity), retrieved January 17, 2013.