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Maintain your home

Cleaning a dirty air filter, wrapping your hot water heater in an insulation blanket, properly insulating your walls and windows, and caulking and weather stripping can save a total of 5,000 pounds of carbon dioxide a year, according to climatecrisis.net, the web site for "An Inconvenient Truth."

Nudge your thermostat up two degrees in the summer and down two degrees in the winter to withhold another 2,000 pounds of CO2. Buying appliances with the Energy Star certification and installing a programmable thermostat helps too. You get your reward in lower gas and electric bills.

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