EPA and the U.S. Department of Transportation (DOT) have signed a notice of intent to conduct joint rulemaking that would propose stringent federal greenhouse gas (GHG) and fuel economy standards for model years 2017-2025 for cars and light trucks. Standards are already in place for the 2016 model year, with cars and light trucks scheduled to achieve 35.5 miles per gallon and an emissions limit of 250 grams per mile of carbon dioxide-equivalent by that year. The notice asks for public comments on four possible targets for reducing emissions beyond 2016: 3 percent, 4 percent, 5 percent, and 6 percent per year. A 3-percent improvement in emissions would result in a 47 mile-per-gallon fuel economy standard and emissions of 190 grams per mile in 2025. The notice indicates that the agencies will issue a proposed rule by September 30, 2011, and a final rule by July 31, 2012.