6. Use High-Efficiency Outdoor Lighting
A typical 100-watt floodlight, if used for six hours a day, can consume up to $40 of electricity over the course of a year and produce upwards of 400 pounds of carbon dioxide, depending on where you live. For starters, replace those floodlights with compact-fluorescent versions-they're just as bright and use a quarter of the energy. Next, replace low-wattage halogen landscape bulbs with LED versions. They cut energy use by over 80 percent and can last for 10 years or more. Finally, install motion sensors on any nonessential lights. New versions just screw right into your existing light socket.
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