Carbon dioxide is one of the leading causes of global warming. Car emissions account for a large part of the carbon dioxide in the atmosphere.

If you're concerned about the environmental impact you're creating each time you drive, consider buying a fuel efficient vehicle such as a hybrid. Hybrids run off both rechargeable batteries and gasoline, so they require less fuel and produce less emissions.

If buying a hybrid isn't in your immediate plans, you can still practice fuel efficiency with the car you have now. Regular tune-ups make your car run smoothly and can improve fuel efficiency by as much as half. Keep your tires filled; under-inflated tires use up more gas. Highway driving? Drive at speed limit. The more you accelerate and then slow down or brake quickly, the more fuel you consume.

If possible, just drive less. Take public transportation, walk or bike when you can.

Doing your part to drive less not only helps the planet -- it helps your wallet, as well.

Visit www.fueleconomy.gov for more information on fuel efficient habits.