A quantitative measure of the amount of carbon emissions attributable to a given organisation, activity (e.g. a sport event) or product. Carbon footprints can be measured at widely different scales, such as for an individual (e.g. one’s personal annual carbon footprint lies typically in the range 1-20 tonnes CO2 eq) all the way to a whole city, region or country, which typically range in the millions of tonnes of CO2 eq.
The term carbon footprint is common currency but strictly speaking it is a measure of a basket of GHG emissions expressed in tonnes of carbon dioxide equivalent (tCO2 eq). Therefore, a more accurate (but less widely understood) term would be 'GHG inventory'