Print on the lowest quality setting to save the amount of ink you use unless absolutely necessary.
Do not use bold font, underlining, our watermark images for office memoes, etc.
Using a slightly smaller font size will also help to save ink.
Print on both sides of the paper, when possible.
Offices generally create quite a bit of paper trash. Encourage your boss to start an office recycling program.
If you can't get an office program started, keep a box next to your desk and encourage co-workers to recycle their paper in your box.
Consider keeping a box in the break room for recyclable soda cans and bottles.
Don't leave office lights on over night and turn off lights whenever you are out of the office.
Try to reduce the amount of electricity used to heat or cool large spaces such as auditoriums, lecture halls, and conference rooms, by setting the thermostat so that it will come on when the space is not in use.
Use reusable envelopes for inter-office communication.
Reuse packing material when mailing packages.
Reuse the copy paper box as a file to keep important papers.
Set your computer to go to standby mode or hibernate when not in use for a certain amount of time.
Turn off computer peripherials, such as printers and speakers, when not in use.
Bring your own cup or mug to work rather than using disposable cups.
On the Road
Drive at slower speeds to conserve gasoline.
Avoid rush hour and heavy traffic areas.
Don't use the AC if you can get by with the fan alone or by cracking the windows. The air compressor requires a lot of gasoline to run.
Newer cars are being made with more efficient engines. Check to see how often you need to change the oil. The old standard 3 months or 3000 miles is not necessary for all vehicles. Your car may only need to be changed every 4-5000+ miles. Check with your owner's manual or car dealership for more details.
Always know how to get where you are going before you leave so that you don't waste gasoline driving around.
Keep your car cleaned out so that you aren't carrying around extra weight all the time.
Purchase a smaller more fuel-efficient vehicle if possible.
Purchase a hybrid car, if possible.
Walk or ride a bike when possible.
Carpool whenever you can.
Use cruise control on the highway.
Make sure to inflate your tires to the recommended pressure. This can have a considerable impact on your gas mileage.
When traveling out of town for a few days or longer, turn off and unplug all unnecessary appliances, turn your heater or AC off or to a more conservative setting, and turn off your hot water heater.
At the Store
Buy food in economy-sized packaging to reduce the amount of trash.
Buy drinks that are packaged in recylable containers and recycle them.
Don't grab utensils such as forks, knives, and spoons unless you actually need them. If they are disposable, then you are creating unnecessary garbage. If they are not, then you are increasing the amount of soap and hot water that must be used to clean them.
Only get as many disposable napkins as you will need. An incredible number of unused napkins are tossed in the trash every minute.
If you take leftovers home, try to plan on when you will eat them so that they aren't simply thrown out.
For the Baby
Use cloth instead of disposable diapers.
Use reusable bibs rather than disposable ones.
Do not fill the bath more than necessary to get your baby clean. When they are really small, you may use the sink or a small wash basin.
Don't give your baby more than he or she will eat. With some snacks, it may be possible to collect the uneaten remainder for later rather than throwing it all out.
Educate your children from birth to conserve and not to be wasteful.
In Your Community
Write letters to local officials encouraging them to create environmentally-friendly legislation.
Write letters to local businesses and encourage them to start recycling programs.