Other calculators
Here is a list of other online carbon/emissions calculators for comparison:
The earth day network's ecological footprint quiz
http://www.earthday.net/footprint/index.asp
Resurgence Magazine's carbon dioxide emissions calculator
http://www.resurgence.org/resources/carbon-calculator.html
The carbon footprint calculator from CarbonFootprint.com
http://www.carbonfootprint.com/calculator.html
A personal emissions calculator developed by the EPA
http://www.epa.gov/climatechange/emissions/ind_calculator.html
The SafeClimate's calculator is a project of the World Resources Institute
http://www.safeclimate.net/calculator/
A carbon calculator created by Carbonfund.org
http://carbonfund.org/site/pages/calculator/
The National Energy Foundation's emissions calculator
http://www.nef.org.uk/energyadvice/co2calculator.htm
Other lists of calculators
This list by COIN also rates and gives comments on the calculators
http://coinet.org.uk/materials/carboncalculations
A list of emissions calculators compilled by The Commons
