An interesting and useful environmental tip from the EPA:
Reduce your carbon footprint! Leaving your car at home twice a week can cut greenhouse gas emissions by 1,600 pounds per year. Save up errands and shopping trips so you need to drive fewer times. If you commute to work, ask if you can work from home at least some days, and you’ll reduce air pollution and traffic congestion – and save money.
Other options include bike commuting, walking/roller-blading to work, taking the bus or train, or carpooling with co-workers. It is amazing how a small change can make a HUGE difference.