The transportation sector is the largest source of U.S. greenhouse gas emissions, with light-duty passenger vehicles accounting for approximately two-thirds of those emissions. In order to address this, 36 states and the District of Columbia have put in place some form of clean vehicle policies. These include emissions standards, zero-emission vehicle deployment–which include both battery electric vehicles and fuel cell electric vehicles, and rebates and incentives for zero-emission vehicles and infrastructure, such as charging stations and hydrogen fueling infrastructure.
A popular policy choice today is providing rebates or other incentives for consumers who purchase electric vehicles. But state policies can reduce transportation sector emissions in other ways as well.
A low-carbon fuel standard (LCFS) is aimed at reducing greenhouse gas emissions by requiring a shift to lower-carbon transportation fuels, such as biofuels, without prescribing a particular fuel type. Currently only California and Oregon have LCFS policies in place. They require fuel providers to continually decrease the carbon intensity of the fuels they sell, and allow for credit trading to reduce costs of compliance.
Land use decisions and public transportation investments also affect transportation sector emissions.