The mayors of the cities including Los Angeles, San Francisco, Seattle, Portland, and Eugene signed the declaration about joint plans to cut carbon emissions by 80 percent by 2050 within their cities. The declaration follows the recent announcement from the Zero Emissions Vehicle (ZEV) Alliance states including California, Rhode Island, Connecticut, Maryland, Massachusetts, New York, Oregon, and Vermont, to make all new cars to be emission free by 2050. The signed declaration would involve the increase of renewable energy source use, and conversions of city vehicles to electric and biodiesel powered.