1. Get a comprehensive, balanced lowdown on nearly any controversial issue with the nonprofit charity ProCon.org: http://www.procon.org/.
2. Check out the online, interactive Global Challenge Award, a program which “empowers students to believe that they can make a difference not only on their own lives and national economies but on the planet itself”: http://www.globalchallengeaward.org/display/public/Home.
3. Learn about holidays around the world on Earth Calendar: http://www.earthcalendar.net/index.php.