- U.S. EPA - http://www.epa.gov/climatechange/emissions/ind_calculator.html
- Carbon Footprint - http://www.carbonfootprint.com/
- Safe Climate - http://www.safeclimate.net/calculator/
- National Recycling Coalition – http://www.nrc-recycle.org/
- Climate Care - http://www.climatecare.org/
- Climate Crisis - http://www.climatecrisis.net/takeaction/carboncalculator/
- Conservation International - http://www.conservation.org/act/live_green/carboncalc/Pages/default.aspx
- World Wildlife Fund - http://footprint.wwf.org.uk/
- Nature Conservancy - http://www.nature.org/initiatives/climatechange/calculator/
- Earth Day Network - http://www.earthday.net/footprint/
- Eco Business Link - http://www.ecobusinesslinks.com/ecological_footprint_calculator.htm
- U. S. EPA WAste Reduction Model (WARM) - http://www.epa.gov/climatechange/wycd/waste/calculators/Warm_home.html
- Earth Future - http://www.earthfuture.com/climate/calculators/
