Everyone knows there are things they should--and shouldn't--do to help the environment. Even so, most people aren't going to completely avoid planes as a way of reducing greenhouse gases. Here are a few reasonable courses of action that every traveler can and should take.

Unplug your appliances

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Many TVs, DVD players, microwave ovens, computers, cell-phone chargers, and other devices drain electricity even when they're not in use. Also, lower your thermostat before leaving for winter vacation, and make sure the air-conditioning is off while you're away in the summer. Turn the hot water heater down to its lowest setting--or shut it off completely, though that'll require you to relight the pilot light when you get home.

Think about how you travel

Takeoff and landing account for a large portion of the fuel use and emissions of flights, so go with direct flights when you can. If possible, take the train instead of a short-haul flight. If you're on a road trip with a group, squeeze into as few cars as possible.

Forget disposable products

Nix the single-use camera, as well as take-out meals with wasteful packaging and plastic utensils. Instead, choose sit-down restaurants or food from the local market. Bring reusable containers for water, coffee, and leftover food. Refilling a bottle at a water fountain is much more eco-considerate than buying water that's been shipped from France or Fiji or somewhere else far away.

 Think before you buy

Rather than buying stuff that you'll use sparingly--tents, beach chairs, voltage converters--borrow them from friends. (And offer your gear to friends for their vacations.) At trip's end, give maps and guidebooks to other travelers, or leave them at the hotel for future guests. When shopping during your vacation, take a tote or backpack--people tend to reuse plastic bags a lot less while they're away from home. And remember that souvenirs that look kitschy and fun on the shelf often end up in a landfill.

Eat with a conscience

Think about where the food on the menu actually comes from. Ask your waiter what's local and choose something produced nearby over something that had to be trucked in.

Treat your hotel room like it's your own house