A carbon footprint (or greenhouse gas footprint) is a "certain amount of gaseous emissions that are relevant to climate change and associated with human production or consumption activities".In some cases, the carbon footprint is expressed as the carbon dioxide equivalent (CO2e) which is meant to sum up the total greenhouse gas (GHG) emissions caused by an individual, event, organization, service, place or product. In other cases, only the carbon dioxide emissions are taken into account but not those of other greenhouse gases.[Greenhouse gases, including the carbon-containing gases carbon dioxide and methane, can be emitted through the burning of fossil fuels, land clearance, and the production and consumption of food, manufactured goods, materials, wood, roads, buildings, transportation and other services. Beyond calculating carbon footprints for whole countries, it is possible to calculate the footprint of cities and smaller regions like neighborhoods but even sectors, companies and products.
Put simply, humanity’s global carbon footprint is the headline indicator for climate change. The global average annual carbon footprint per person in 2014 was about 5 tonnes The average carbon footprint for a U.S. citizen is 16 tons. This is one of the highest rates in the world.
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