Inflate Your Tires: Keep the tires on your car adequately inflated. Check them monthly. Save 250 lbs. of carbon dioxide and $840 per year. Change Your Air Filter: check your car's air filter monthly. Save 800 lbs. of carbon dioxide and $130 per year. Use Compact Fluorescent Bulbs: Replace 3 frequently used light bulbs with compact fluorescent bulbs. Save 300 lbs. of carbon dioxide and $60 per year. Adjust Your Thermostat: Move your heater thermostat down two degrees in winter and up two degrees in the summer. Save 2000 lbs of carbon dioxide and $98 per year.