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[–] ArsCortica 0 points 1 point (+1|-0) ago 

It basically an estimate of how much carbon dioxide is blown into the atmosphere due to your actions. For instance, a person who will exclusively travel by bike or public transportation such as buses unsurprisingly would produce less carbon dioxide than someone who'd spend all day flying around in his private jet while burning kerosene like crazy.

Whether or not producing more or less carbon dioxide is an inherently bad thing depends on who you ask.