Passenger cars are 33% of transport-related GHGs, the single largest category for transportation-related GHGs. Transportation-related GHGs is the largest category of GHGs in the whole pie for the US and comprises 27% of US GHGs. 33% of 27% is 8.9%. Light-duty trucks are 17.2% of transportation-related GHGs, so 4.6% of overall US GHGs. The US already has a heavily used freight-rail network.
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