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What goes into the carbon calculator black box?

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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