The Environmental Protection Agency suggests purchasing Energy Star products for the home and office. Begin by replacing easy-to-install, modestly-priced items such as air filters or light bulbs. According to the EPA, "If every American home replaced their 5 most frequently used light fixtures or the bulbs in them with ENERGY STAR qualified lighting, we would save close to $8 billion each year in energy costs."
Lower your heating and cooling costs in two ways. Purchase an ENERGY STAR qualified programmable thermostat that operates on stand-by mode; this will help lower bills when the home owner or office staff is away.
Ensure that your home's insulation and sealing is up-to-date and efficient. Check windows, doors, ceilings and floors for air leaks, and repair as necessary.
Keep your car maintained to reduce the amount of pollution it causes. If possible, reduce the amount of miles you drive by joining a carpool or working from home on slow days.
If and when you are in the market to purchase a new car, consider one that is fuel efficient and environmentally friendly. The EPA offers a free resource to help you choose an energy-efficient car.
No matter what type of car you drive, the EPA recommends filling your gas tank in the early morning or at night, which "will reduce the amount of evaporative emissions being pushed out of the tank during the heat of the day, when smog most easily forms."