Change To Energy Efficient Light Bulbs.
Lighting accounts for 20% of all electricity consumed in the U.S. One of the easiest ways to reduce your energy use and green-house-gas emissions is to replace your regular light bulbs with super efficient compact fluorescent bulbs. They have the same warm color as regular light bulbs. If every household replaced one conventional light bulb with a CFL bulb, it would have the same effect as removing 1 million cars from America’s roads. Each CFL bulb will reduce your CO2 emissions by over 150 pounds a year. I have purchased them at Costco and hardware and grocery stores for $1 each on promotion.

Use A Clothesline To Dry Your Clothes Instead Of A Dryer
Why generate CO2 using fossil fuel to dry your clothes when the sun can do it without generating greenhouse gasses? You can save 700 pounds of CO2 when you air dry your clothes for 6 months out of the year.

Turn Your Thermostat Down 2 Degrees In The Winter and Up 2 Degrees In The Summer - Save 2,000 lbs. of CO2.

Clean or Replace Filters On Your Furnace and Air Conditioner - Save 350 lbs. of CO2 a year.

Use Power Strips - Cable boxes, video game boxes and to a lesser extent TV's and VCR's use almost as much energy when they're off as when they're on. Any transformer (the boxy black thing on the end of the electrical cord of many of your electronic devices) uses electricity even when the device is off. Make it easy to turn your electronic devices all the way off - plug them into a power strip and turn off the whole strip.

Use Less Hot Water
Install a low flow showerhead (save 350 pounds of CO2 a year) and wash your clothes in cold or warm water instead of hot water (save 500 pounds a year).

Wrap Your Water Heater in an Insulation Blanket - Save 1,000 lbs. a year of CO2.

Turn Off Electronic Devices You Are Not Using - Save thousands of lbs. a year of CO2.

Insulate Your Home - Almost half of the energy you use in your home goes to heating and cooling. Insulating your walls and ceilings can save 25% of your home heating bill and 2,000 lbs. of CO2. Caulking and weather-stripping can save another 1,700 lbs. a year.