Look at these sites for ideas and facts.

http://www.picadome.fcps.net/Lab/currl/earth_day/default.htm

http://www.ypte.org.uk/environmental-facts.php

http://www.earthdaytv.net/

http://www.earthday.gov/classroom.htm#learn

http://www.epa.gov/recyclecity/

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

http://www.med.nyu.edu/environmental/outreach/topics.html

http://www.cqs.com/egeneral.htm

http://www.niehs.nih.gov/health/topics/

http://www.epa.gov/ebtpages/alphabet.html

http://www.cgrer.uiowa.edu/servers/servers_environment.html

http://www.science.gov/browse/w_123.htm

http://www.environmentalz.com/

http://thinkgreen.com/earth-day/?
gclid=CNDI1faGgJoCFSbxDAodngJDFA&ef_id=2093:3:s_826ac3b38642861297c162289d8c0a91_3204547075:btrFGEo-
JyIAAAkGfAkAAAAd:20090420180935

http://www.education-world.com/a_lesson/lesson174.shtml

http://my.nature.org/earthday/

http://www.huffingtonpost.com/marianne-schnall/this-year-make-earth-day_b_188652.html

http://www.planetpals.com/fastfacts.html

http://sustainability.und.edu/earthday.html