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This site does a great job of making climate change understandable to elementary and middle school students. Do see "The Climate Detectives," on how scientists gather data on global changes. Created by: The U.S. Environmental Protection Agency (EPA), Washington, DC. Don't miss: The "Climate Change Calculator." Detour: For EPA content for high school students, go to epa.gov/climatechange/index.html.

www.pbs.org/wgbh/warming

This site for high school students explores not only the research around global warming, but also the highly charged debate within the scientific community. Created by: WGBH, Boston, MA. Don't miss: Play the "Your Carbon Diet" game to find out how many kilowatts, gallons of oil or gas, and pounds of CO2 you can save. Detour: "Nova—Warnings from the Ice." 

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Perfect for high school students, this excellent site, created by the Exploratorium in San Francisco, features research conducted by scientists across various disciplines. Don't miss: Much of the data here is near real time—hard to find elsewhere. Helpful glossary terms and webliographies appear at the bottom of each page. Detour: "Ice Stories: Dispatches from Polar Scientists." 

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Here you'll find a great overview, describing possible causes of global warming, its effects on the earth and its inhabitants, the science behind it, and potential solutions to the problem. Created by: The National Geographic Society, Washington, DC. Target audience: Middle, high school. Don't miss: The three dramatic photo galleries showing changes in the Arctic and Antarctic regions. Detour: "Signs from Earth."

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Kids will find this highly creative site both educational and entertaining. Of special note: the online game "Rising CO2! What Can We Do?"—fun and a real eye-opener. Created by: The American Museum of Natural History, New York, NY. Target audience: Upper elementary, middle school. Don't miss: "Make Your Own Weather Station."