In the United States, the transport of goods and services is highly reliant on a single fuel—petroleum—about 60 percent of which is imported. Almost 28 percent of U.S. GHG emissions can be attributed to the transportation sector, with the overwhelm

15 For additional discussion and references, see Chapter 13 in Part II of the report.

ing share in the form of CO2 emitted from combustion of petroleum-based fuels. The transportation sector also emits other pollutants that endanger human health. The transportation sector thus stands at the nexus of climate change, human health, economic growth, and national security.

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