Use the EPA's online tool to calculate your carbon footprint
The U.S. EPA has a great resource for homeowners looking to estimate their carbon footprint: the Carbon Footprint Calculator.
This quick online tool covers the categories of home energy, transportation and waste. To start, you plug in your zip code and the number of people in your household. Then, for each of the three sectors, enter your current usage, as well as actions you might take to reduce it in the future, such as adjusting your thermostat or driving fewer miles.
The calculator adjusts as you go, giving you a total compared with the U.S. average for the zip code and number of people in your home. Click "View the report" at the end to see a graphic breakdown of your planned actions and how they translate into reduced CO2 and dollars saved.