Also, you could...

1. Be bright about light
Make it a habit to turn off the lights when you're leaving any room for 15 minutes or more and utilize natural light when you can. Buy Energy Star-rated light bulbs and fixtures, which use at least two-thirds less energy than regular lighting.

2. Maximize computer efficiency
Make it a habit to turn off your computer—and the power strip it's plugged into—when you leave for the day. During the day, setting your computer to go to sleep automatically during short breaks can cut energy use by 70 percent. Remember, screen savers don't save energy.

3. Print smarter
Make it a habit to print on both sides or use the back side of old documents for faxes, scrap paper, or drafts. Avoid color printing and print in draft mode whenever feasible. Also consider switching to a lighter stock of paper or alternatives made from bamboo, hemp, organic cotton, or kenaf. Recycle toner and ink cartridges and buy remanufactured ones.

4. Go paperless when possible
Make it a habit to think before you print: could this be read or stored online instead? When you receive unwanted catalogs, newsletters, magazines, or junk mail, request to be removed from the mailing list before you recycle the item.

5. Ramp up your recycling
Make it a habit to recycle everything you collect. Just about any kind of paper you would encounter, including old seminar notes, envelopes, and junk mail, can be recycled. So can your old cell phone, PDA, or charger.

6. Close the loop
Make it a point to purchase items made from recycled materials.

7. Watch what (and how) you eat
Make it a habit to bring your refillable water bottled. Switch to Fair Trade and organic coffee and tea, and buy as much organic and local food as possible.

8. Rethink your travel
Make it a habit to take the train, bus, or subway when feasible when traveling. Walking is another option, it's good for the environment and good for your health.

9. Create a healthy living environment
Make it a habit to use nontoxic cleaning products. Brighten up your home with plants, which absorb indoor pollution. Make it a policy to buy furniture, carpeting, and paint that are free of volatile organic compounds (VOCs) and won't off-gas toxic chemicals.