1. http://www.jstor.org/view/00129658/di960362/96pp003z/0
It gives an author and is a journal from the Ecological Society of American published in 1994.
2. http://www.epa.gov/climatechange/kids/gw.html
Is a government site sponsored by the U.S. environmental Protection agency and was last updated in 2006.
3. http://science.nasa.gov/headlines/y2004/05_arctic.htm
This site is sponsored by NASA and is a government site and was written in 2004.
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