Seal Up Your House
What's the easiest way to increase your home's energy efficiency? Plug up those holes, says Kim Master, 30, who coauthored a book on sustainable home design, "Green Remodeling: Changing the World One Room at a Time." "Energy conservation isn't just about putting up solar panels," she says. "You can do so many little things that make a huge difference." Apply weather stripping to windows and doors and caulk other leaky spots. They might not seem like much, but a 1/8-inch gap along the threshold of the front door is like having a 2-inch hole in the middle of the wall. Home sealing can also drastically reduce your energy bill -- even by 10 percent, according to the U.S. Department of Energy.

Buy Recycled TP
Believe it or not, recycled toilet paper can change the world. "If every household in the U.S. bought just one four-pack of 260-sheet recycled bath tissue, it would eliminate 60,600 pounds of chlorine pollution, preserve 356 million gallons of fresh water, and save 988,000 trees," says Jeffrey Hollender, 52, whose company, Seventh Generation, offers a range of environmentally conscious consumer goods. Using recycled paper products saves manufacturers a trip into the forest and doesn't require the energy needed to extract pulp from trees. Plus, a four-pack of the recycled kind costs about the same as conventional. You can effect change, Hollender insists, "one roll of toilet paper at a time."

Use Clean Energy
"The time is now to make changes," insists Edward Norton, the 37-year-old actor and founder of the BP Solar Neighbors Program, a partnership between the Enterprise Foundation and BP, an alternative energy supplier that works to help low-income families use solar power to reduce their utility costs. By having solar panels installed on your home, he says, "you help the environment and save money." BP can set you up with solar power in California, New York, and New Jersey (visit bp.com). If you're not ready to commit to solar, however, you can still offset your current energy use by supporting clean energy programs. Find out how at smartpower.org.