Scientists have determined that a number of human activities are contributing to global warming by adding excessive amounts of greenhouse gases to the atmosphere. Greenhouse gases such as carbon dioxide accummulate in the atmosphere and trap heat that normally would exit into outer space.
http://environment.about.com/od/faqglobalwarming/f/globalwarming.htm?utm_term=Global%20Warming%20Causes&utm_content=p1-main-1-title&utm_medium=sem-rel&utm_source=msn_s&utm_campaign=adid-82cde265-9dc7-4935-b074-0eb82273ce38-0-ab_mse_ocode-28799&ad=semD&an=msn_s&am=exact&q=Global%20Warming%20Causes&o=28799&qsrc=6&l=&askid=82cde265-9dc7-4935-b074-0eb82273ce38-0-ab_mse
Article courtesy of About News by Larry West
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