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Carbon Footprint - css.umich.edu

Sustainability IndicatorsFor Complete Set of Factsheets visit Footprint A Carbon Footprint is the total greenhouse gas (GHG) emissions caused directly and indirectly by an individual, organization, event or product. 1 It is calculated by summing the emissions resulting from every stage of a product or service s lifetime (material production, manufacturing, use, and end-of-life). Throughout a product s lifetime, or lifecycle, different GHGs may be emitted, such as Carbon dioxide (CO ), methane (CH ), and nitrous oxide (N O), each with a greater or lesser ability to trap heat in the atmosphere. These differences are accounted for by the global warming potential (GWP) of each gas, resulting in a Carbon Footprint in units of mass of Carbon dioxide equivalents (CO e).

• Domestic air travel fuel efficiency (passenger miles/gallon) rose by 115% from 1990 to 2019, largely due to increased occupancy.20 Emissions per domestic passenger-mile decreased 45% from 1990-2019, due to increased occupancy and fuel efficiency. 6,20

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