In 2002, California enacted AB 1493, a law requiring the California Air Resources Board (CARB) to adopt standards to control the emissions of greenhouse gases from the tailpipes of light-duty vehicles. CARB has since issued those standards, which will apply to the 2009 new model year forward if CARB receives a waiver from the U.S. Environmental Protection Agency (EPA). Sixteen other states have adopted or have announced their intention adopt the California tailpipe standards.