So i just calculated my carbon footprint at What is Your Carbon Footprint . Wow, I thought I was doing a sufficient job at keeping my carbon footprint in check and this was certainly eye opening! My score was 43 tons of CO2 vs. the national average of 24 tons of CO2! I couldn't believe it! And get this, the world average is 5.5 ! I know I am changing things in my lifestyle, like simply switching to energy efficient lightbulbs and turning down our hot water heater by a few degrees. Check out yours and come up with ways that you can offset your carbon footprint.