National Geographic's Green Guide has a survey that you can fill out to find out your Greendex number. You can then compare how environmentally friendly you are living, compared to people in 14 different countries. Factors considered include energy use and conservation, transportation choices, food sources, the relative use of green products versus traditional products, attitudes towards the environment and sustainability, and knowledge of environmental issues.
http://event.nationalgeographic.com/greendex/calculator.html

