What are the challenges facing public interest groups as a result of their transformation from the small, grassroots groups of the 1960s into the large, professionalized, multi-billion dollar industry of the '90s? How might public interest groups meet these challenges as they move into the next century? Focusing on national environmental organizations, including Sierra Club, National Wildlife Federation, The Wilderness Society, and Environmental Defense Fund, Voices and Echoes for the Environment demonstrates how the demands of organizational maintenance encroach on the goal of effective policy influence.