 Stocks closed lower on Wall Street today. The Dow was down 45 points. You're listening to NPR. Activists are urging Arizona's governor to shut down a uranium mine over environmental concerns south of the Grand Canyon. Gabriel Paterazzo of member station KJZZ reports. Environmental groups gathered at the Arizona state capitol to deliver more than 17,000 signatures urging Democratic Governor Katie Hobbs to shut down Pinon Plain Mine.