- http://www.cserc.org/sierra-fun/games/watershed-game/
- https://www3.epa.gov/watersense/kids/index.html
- http://www.scholastic.com/powerofgreen/
- http://teacher.scholastic.com/activities/explorer/ecosystems/index.htm
- http://www.scholastic.com/kab/index.htm Keep America Beautiful
- https://kids.usa.gov/science/our-planet/index.shtml
- https://www.energystar.gov/index.cfm?c=kids.kids_index
- Earth Day Book List
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