Carbon Footprint refers to the the total greenhouse gas emissions that result from a person, organisation, product or service over a given time.
It tends to act as an umbrella term for any attempt to measure greenhouse gas emissions and as a result can refer to simply the emissions that result from a single activity, such as flying; the emissions that result from an organisation or building over the course of a year; or the full lifetime emissions of a product or organisation, including emissions from the supply chain or disposal of resources.
While carbon footprints colloquially refer to the amount of CO2 emitted, the UK Carbon Trust endorses a wider definition and considers all six of the Kyoto Protocol greenhouse gases - Carbon dioxide, Methane, Nitrous oxide, Hydrofluorocarbons, Perfluorocarbons, and Sulphur hexafluoride - when measuring a carbon footprint.
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