Environmental Defense PaperCalculator - Calculate the environmental impact of the paper products you use.
The Carbon Diet - Track your carbon footprint every day and compare your footprint with those of your friends.
NativeEnergy - Carbon offsets and a travel carbon calculator.
The Nature Conservancy Carbon Calculator - Another carbon footprint calculator.
BeGreen - A carbon calculator and information resource that also offers carbon offsets.
zerofootprint - Helping individuals, organizations, and cities reduce their environmental impact (their goal is to get 1,000,000 people pledging to reduce their environmental footprint by 10% in one year).
Yahoo! Green Carbon Footprint Calculator - Another carbon footprint calculator.
Ecological Footprint Quiz - Find out how much “nature” your lifestyle requires.
terrapass - A carbon offset company that has an emissions calculator.
