SOURCE

http://www.sciencemag.org/cgi/content/abstract/277/5325/494

http://news.bbc.co.uk/2/hi/uk_news/4228411.stm

http://www.nrdc.org/globalwarming/qthinice.asp

http://www.nas.nasa.gov/About/Education/Ozone/ozonelayer.html

http://en.wikipedia.org/wiki/Ozone_depletion

http://en.wikipedia.org/wiki/Global_warming