Public Transportation | MIT Climate Portal
Public transportation gets people where they're going while emitting far fewer climate-warming greenhouse gases than private cars.
GHG intensity of passenger transit modes, 2019
1 The effect of different modes of travel on the climate can be measured in “grams of carbon dioxide-equivalent per passenger-kilometer” (gCO2-eq/pkm), or how much CO2 and other greenhouse gases a single passenger puts in the atmosphere for every kilometer they travel. According to the International Energy Agency, cars emit between 57 and 322 gCO2-eq/pkm—compared to buses at just 22-92 gCO2-eq/pkm, and trains at 6-118 gCO2-eq/pkm. International Energy Agency: “ <anchor>GHG intensity of passenger transit modes, 2019</anchor>.”
GHG intensity of passenger transport modes, 2019 – Charts – Data & Statistics - IEA
GHG intensity of passenger transport modes, 2019 – Charts – Data & Statistics - IEA

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# GHG intensity of passenger transport modes, 2019

Last updated 27 May 2020

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IEA (2020), _GHG intensity of passenger transport modes, 2019_, IEA, Paris https://www.iea.org/data-and-statistics/charts/ghg-intensity-of-passenger-transport-modes-2019, Licence: CC BY 4.0

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###### Sources

IEA Mobility Model, May 2020 version.

###### Notes

pkm = passenger kilometres, a metric of transport activity: when a single passenger travels a single kilometre, the result is 1 pkm of travel. gCO2-eq = grammes of CO2-equivalent, on a well-to-wheel basis. The boxes in this figure indicate the range of average energy intensity in various countries, while points indicate global averages. The WTW GHG intensity of passenger aviation excludes non-CO2 climate-forcing impacts.

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