In 1988, during his first presidential campaign, George H. W. Bush was vocal about environmental issues. Following his election victory, he appointed William K. Reilly, an environmentalist, as EPA Administrator. Under Reilly's leadership, the EPA implemented voluntary programs and initiated the development of a "cluster rule" for multimedia regulation of the pulp and paper industry. At the time, the environment was increasingly being recognized as a regional issue, which was reflected in 1990 amendment of the Clean Air Act and new approaches by the agency.