A veritable green toolbox for the environmentally concerned is just a few mouse-clicks away. Several online green auditing tools can help you calculate your environmental impact and answer pressing questions about how you can lessen the stress you place on the planet.

The Personal Environmental Impact Calculator
A good place to start when conducting a personal environmental audit. It helps you measure your weight on the earth in terms of water and energy use, transportation habits, and recycling behavior.

Ecological Footprint Quiz
The average American might stomp on 24 acres of land and water a year. The quiz helps determine how many acres it takes to support your lifestyle. After you finish the short survey, you can navigate the site's resources for tips on going on an energy-use diet.

SafeClimate Carbon Footprint Calculator
To calculate your carbon footprint, you'll need to have your home energy bills handy. This site even helps you track your progress in reducing your carbon emissions.

Add Up Your CO2 Emissions
If you're in a hurry or you've lost (or recycled) your energy bills, this handy survey can help you estimate your average yearly CO2 emissions.

AirHead Emissions Calculator
This calculator helps you evaluate and track personal pollution on a monthly basis and even generates colorful graphs based on the information you provide, comparing your emissions to the national average and your previous months' emissions.