An Update on Public Transportation's Impacts on Greenhouse Gas Emissions (2021) / Chapter Skim
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1 Transportation is a major source of the greenhouse gas (GHG) emissions that are causing climate change (U.S.
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2 An Update on Public Transportation's Impacts on Greenhouse Gas Emissions This study takes into account the full life cycle of transportation fuels (see Figure 1) , as follows: • Direct CO2e emissions at the vehicle.
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Summary 3 The most carbonefficient transit mode on a perpassengermile basis was railbased transit, which transported 60% of passenger miles in 2018. Buses varied in emissions efficiency depending on fuel, technology, operations, and occupancy.
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4 An Update on Public Transportation's Impacts on Greenhouse Gas Emissions • Upstream Emissions, sometimes referred to as "welltopump" emissions, are the GHG emissions that occurred during fuel production and distribution. Thus, the emissions values presented here are "welltowheels" values or the full life cycle GHG emissions associated with using a fuel.
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