November brings with it the start of the holiday season, school breaks and family vacations. Whether you're visiting Grandma Millie in Cheboygan or escaping to the Bahamas, many of us may travel more in the next few months than we do all year. The bad news is that travel produces a lot of carbon dioxide, the primary culprit in global warming. The good news is it's easier than ever to choose more eco-friendly travel methods and offset the emissions from your journeys. Here are several ideas to consider when making travel plans.

Bus and Rail
Staying in the country, your region, state or even city can leave a far smaller footprint that stepping abroad ? the closer you stay to home, the fewer fossil fuels will be burned. Taking a trip within the United States opens up the option of taking a bus or even riding a train. A tour by train can be a vacation in itself, and is a fun way to enjoy the scenery and get off the main path.

Driving
If you can drive rather than fly, drive a small car with good gas mileage. Also look for rental companies that offer hybrid-electric vehicles. Among these, Enterprise Rent-A-Car recently launched the 50 Million Tree Pledge ? committing to underwrite the planting of 1 million trees a year for 50 years as part of their environmental stewardship program. If you're traveling to Los Angeles or Maui, you can even rent a biodiesel-powered Volkswagen Bug from Bio-Beetle. Cities throughout the U.S., Canada and abroad also offer car sharing programs ? simply pay per trip to reserve a vehicle for a few hours or several days. No matter what the vehicle, hitch a ride with grandma and your kid brother rather than taking separate cars. You'll save gas, and are practically guaranteed to get a good story or two in the deal.

Flying
Airplanes burn the most fuel during lift-off and landing, so book a direct flight to reduce both, and decrease the total distance traveled along the way. And try to save air travel for when it's the best or only option. Whether you're taking a train, plane or automobile, Web sites such as TerraPass