How much CO2 your lifestyle creates is called your "carbon footprint." Home energy use, cars, and airplanes are how most of us produce carbon. Is your footprint average? Answer a few easy questions to learn your shoe size.
Carbon dioxide (CO2) is the main greenhouse gas behind global warming. Using fossil fuels like oil, gas, and coal sends lots of CO2 into the atmosphere, and this traps heat.
Our energy plants create CO2 when they power our houses and offices, and our cars and planes spit out carbon in tailpipe and jet emissions. So if we cut back on energy use, driving, and flying, we can limit how CO2 is changing our climate.