and EarthMoment have partnered with airlines, car rentals, passenger railways and hotels so that a portion of your purchase price goes to fund carbon offsets ? or you can calculate the footprint of your trip and purchase offsets directly.

Public Transportation
No matter how you get to your destination, don't forget about the travel during your stay. Try walking or taking public transit rather than renting a car. Many cities have some form of public transportation, and the largest ones, such as New York City, Washington D.C., Boston, Seattle and Los Angeles have extensive systems such that you won't need a rental car. You'll enjoy the lower cost, no parking hassles, less time stuck in congestion and a smarter environmental choice. City transit usually includes convenient stops at parks, museums and other cultural offerings. Walking is a great way to see communities and discover great nooks and hidden treats.

Accomodations
All that walking warrants a great place to unwind at the end of the day, and you don't want to dash your efforts with eco-indifferent accommodations. Use sites such as Environmentally Friendly Hotels to find ratings and reviews of hotels and their sustainability efforts. During your stay, request that linens not be changed until you check out instead of every morning. Also hang towels on the racks, as towels on the floor indicate to housekeeping that they need to be replaced. Some hotels are determined in their daily cleaning, so if all else fails keep the 'Do Not Disturb' sign on your door until the room needs refreshing.

Extras
Try as you might, a perfect, zero-footprint vacation often isn't feasible without a little help. With EarthMoment, you can calculate your carbon footprint and use your regular shopping to offset it. Whether you're buying airfare, a gift for mom or music for the trip, your purchase will support your choice of renewable energy, energy efficiency or reforestation (at no extra cost).

Have a great, green adventure!

Do you utilize carbon offsets or have tips for low-impact traveling? Share your ideas and resources in the comments section below.