In '72, EPA battled pollution; now it's politics - Article Photos 16/37

** ADVANCE FOR SUNDAY APRIL 22, 2012 AND THEREAFTER ** This July 1973 photo released by the U.S. National Archives shows Clark Avenue and the Clark Avenue Bridge in Cleveland, Ohio, looking east from west 13th Street, are obscured by the smoke from heavy industry. The image was taken as part of the new Environmental Protection Agency's "Documerica" program, 1972-1977, to document subjects of environmental concern. (AP Photo/U.S. National Archives, Frank J. Aleksandrowicz)