With over 200 million vehicles on U.S. roads, effectively managing automobile CO2 emissions is challenging. Many actors determine how much vehicles emit, including automakers, fuel providers, consumers and all levels of government.
Climate-warming carbon emissions from new vehicles in the United States dropped 3 percent in 2005, the first decrease in nearly two decades, Environmental Defense reports.
High fuel prices and tighter fuel efficiency standards for light trucks have helped push down carbon emissions, the report said.
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