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Carbon calculators abound, but which ones measure up?

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Users can customize this carbon calculator from Zerofootprint and use it to track their emissions. (Courtesy of Zerofootprint.net)

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Zerofootprint's carbon calculator asks users to answer questions ranging from travel habits to the food they eat. (Courtesy of Zerofootprint.net)

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GreenIQ.com's calculator focuses on how everyday habits, such as unplugging appliances when not in use, affect a user's carbon footprint. (Courtesy of GreenIQ.com)

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The Nature Conservancy's carbon calculator compares its users' carbon footprints to the U.S. and world averages. (Courtesy of The Nature Conservan)

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GreenIQ.com's calculator focuses on how everyday habits, such as unplugging appliances when not in use, affect a user's carbon footprint. (Courtesy of GreenIQ.com)

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More Americans are turning to online calculators to tell them how their lifestyles are affecting the environment. But as each one spits out a different answer, experts are asking how useful they really are.


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