Earth Day

Earth Day Network
Website: http://www.earthday.net
"Earth Day Network was founded on the premise that all people, regardless of race, gender, income or geography, have a moral right to a healthy, sustainable environment.  Our mission is to broaden and diversify the environmental movement worldwide, and to mobilize it as the most effective vehicle for promoting a healthy, sustainable environment.  We pursue our mission through a combination of education, public policy, and consumer activism campaigns.  Our campaign and programs are predicated on the belief that an educated, energized population will take action to secure a healthy future for itself and its children.  Earh Day Network has a global reach with a network of more than 17,000 partners and organizations in 174 countries.  More than 1 billion people participate in Earth Day activities, making it the largest secular civic event in the world. 
     "Start your tour.  Explore the average US footprint and test your knowledge."

NSTA Earth Day Resources
Website: http://science.nsta.org/nstaexpress/nstaexpress_2005_02_28_esteme.htm
National Science Teacher Association (NSTA) lists a number of Earth Day teaching materials and activities for students of all ages.  "Educators planning to celebrate Earth Day with their students can take advantage of free resources" listed on the website.