26. Turn off the lights: When leaving the office or classroom, a simple flip of a switch conserves energy. Yet a surprising number of empty offices, conference rooms, restrooms and lobbies are lit for hours each day (and night) while going unused.

27. Use electronic communications: Submit and distribute assignments and reports electronically. E-mailing a document allows for easier, from-anywhere reference for a teacher or colleague -- and provides proof that it was sent on time. For in-progress documents, electronic transmission also make it easy to collaborate.

28. Fax smart: Sending faxes directly from the computer avoids using paper altogether. But if a traditional fax is the only option, either avoid using a cover page or create a reusable cover by laminating the page and using an erasable marker. In addition, avoid the automatic activity report function to save another page. It may be "just a single sheet" of paper, but if everyone followed these green rules, it would really add up.

29. Pack a waste-free lunch: Eliminate plastic bags, plastic utensils, disposable containers, paper napkins and those brown bags. Instead use a lunchbox, reusable drink container, cloth napkin and silverware. Find odd pieces of used silverware at a second-hand store so you don't lose parts of your good set. Sandwiches, fresh fruit, vegetables and treats packaged in reusable containers are healthy alternatives to cafeteria and prepackaged foods. They can also be bought in larger quantities, saving money and packaging.

30. Teleconference, don't travel: With hotel, airfare, local transportation, meals, entertainment expenses and tips, business travel certainly adds up. Today's technology expands the definition of face-to-face contact, making a quick meeting with a client or colleague across the country, or the world, possible. Online professional development options abound, as well -- from Web seminars to entire conferences being held virtually.

31. Office & Desk supplies: Keep reuse in mind with desk supplies. Refillable pens and pencils help reduce waste, and items such as paper clips, folders and binders can be saved and reused. The key is staying organized, collecting used supplies of like kinds in the same spot and keeping them within easy reach.

32. Save packing materials: In other words, what comes in should go back out. When having to buy boxes and other packing supplies, look for products made from recycled material or those that are biodegradable.

33. Use recycled paper: Compared to other paper, it takes a lot less energy and water to make. And thanks to increased demand, manufacturers have been able to match quality and performance. Speaking of paper, it's got two sides, so when possible, use them both.

34. Use recycled paper: Pens are often tossed into the garbage and not recycled or reused. Their components and packaging are made from nonrenewable resources and can contain environmentally damaging chemicals. Pen refills cost as little as $1 each, which is almost the same as a new disposable pen.

35. Commute smart: That means walking or biking to work or the classroom if practical, or the ever-promoted public transportation option.

36. Tap the tap: Encourage your school or workplace to get a filtration system for the faucet instead, and it'll be part of the solution rather than part of the problem. Besides, many bottled-water companies use tap water anyway.

37. Carpool: Carpooling saves time and money. On a typical day, the average mother with school-age children spends 66 minutes driving -- taking more than five trips to and from home and covering 29 miles. The average commuter carpooling every day would save 500 gallons of gasoline, and 550 pounds of poisonous exhaust emission every year.

38. Switch Off Your Computer: The "sleep mode" reduces energy use by 60 percent to 70 percent, the EPA estimates. As for turning computers on and off, despite a popular misconception, this won't harm the equipment. It will, however, save energy as long as the computer will be inactive for 16 minutes or more. If your job doesn't require constant computer use, break the habit of turning it on first thing and keeping it on all day.

39. Turn Off your Computer Monitor: Turn off your computer's monitor when you're not using it. Screen savers only save the screen from having a pattern burned into it. Energy saving options in Windows still use energy - switch it off (the switch is likely accessible and easy to find!)

40. Think green on computers: When considering a computer brand and model, seek products created for reduced toxin use, that use recycled materials and that prioritize life-cycle management issues. The Energy Star symbol is an easy way to identify energy efficient products, but electricity isn't the only factor to consider.