Started by the late Gaylord Nelson of Wisconsin, Earth Day has become a world wide event in its over thirty years of existence, and educators will find this site most helpful as they begin to develop lesson plans and exercises around this event. Created by the American Chemical Society, this site contains links to online resources that deal with the climate, various climatic regions, and ongoing changes in climate. The links are organized into three sections, and visitors can also read brief descriptions of the materials they can find on each site. There’s some very find links here, including one to NASA’s Earth Observing System and the Global Climate Change site offered by The Exploratorium Museum in San Francisco.

This clearinghouse page provides links to web-based resources about climate, in keeping with the American Chemical Society's celebration of Earth Day 2005. The links are arranged by topic (what is climate?, climates of the world, changes in climate); each link is accompanied by a brief description of its content and a grade level ranking. There is also a link to a separate list of print resources on the same topics.