To commemorate Earth Day, today I'm providing two links that I hope you'll find relevant. The first, http://earthday.envirolink.org/history.html, provides an interesting history of Earth Day, authored by Senator Gaylord Nelson, the founder of Earth Day.
The second link is to the Earth Day Network, accessible at: http://www.earthday.net/
This resource provides information on Earth Day events, activities, and actions.
Earth Day 2009 marks the beginning of a two-year push called "The Green Generation Campaign," which will also be the focus of the 40th Anniversary of Earth Day in 2010.