How is your carbon footprint calculated?

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What goes into the carbon calculator black box?

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carbon footprint calculator concept dial measuring carbon levels over aerial view of suburban houses
What actually goes into calculating an accurate carbon footprint for a household or country? Illustration by Marc Blazewicz. Credit: Filo / DIgitalVision Vectors via Getty.

Decided to use an online carbon calculator to review your lifestyle choices? Best pop some ginger tablets: there are choppy seas ahead.

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