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Given car ownership rates for the U.S., transportation emissions are a major concern in this country. Transportation is responsible for 29 percent of the nation’s emissions as demonstrated in the next image. This sector is the fastest growing, accounting for almost half (48 percent) of the net increase in U.S. emissions since 1990. This rapid growth and sizeable portion of the overall emissions profile also means that there is ample opportunity for reductions.
Credit: Inventory of the US Greenhouse Gas Emissions and Sinks: 1990-2017 by the US Environmental Protection Agency (2019). (Public Domain)