Your refrigerator works 24 hours a day, so if is not efficient, it wastes a lot of electricity. 
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Refrigerators made before the year 2000 are significantly inefficient compared to new EnergyStar models. 
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If you replace a refrigerator made before 2000 with a new EnergyStar frig, give yourself 500 pounds in CO2 savings.
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You save another 500 pounds if you remove a second, older refrigerator or freezer that is still running. Getting rid of this (or simply unplugging it and never using it) will save you a LOT of energy and cost, and your electric utility may come take it away for free.