
http://photoscience.la.asu.edu/photosyn/education/learn.html
http://www.pbs.org/wgbh/nova/methuselah/photosynthesis.html
http://www.mi.mun.ca/mi-net/enviro/photo.htm
http://www.esf.edu/pubprog/brochure/leaves/leaves.htm
http://www.americanforests.org/
http://www.americanforests.org/global_releaf