This joint resolution would overturn an Environmental Protection Agency rule that granted California a waiver to set its own vehicle emission standards for greenhouse gases starting with the 2009 model year. Under the Clean Air Act, California has special authority to establish pollution standards stricter than federal requirements, and this 2009 EPA decision approved California's use of that authority for greenhouse gas emissions from new cars. If passed, this resolution would eliminate that waiver and prevent California from enforcing its own greenhouse gas standards, effectively returning the state to following federal emission rules. The resolution uses the congressional disapproval process, which allows Congress to overturn federal agency rules under a streamlined procedure. This bill directly affects California's ability to regulate vehicle emissions and would impact automakers that sell vehicles in the state, as well as consumers in California and other states that have adopted similar emission standards.