Pollution control policy is an area fraught with political complexity, scientific uncertainty, and technological unpredictability. The previous chapters have analyzed policy outputs and outcomes in the areas of air and water quality regulation. This final chapter summarizes some of the more important findings from this research and interprets them with respect to what they can tell us about the responsiveness of governmental institutions and the adequacy of governmental responses to environmental problems. Finally, the future prospects for pollution control and environmental policy are discussed in conjunction with state capacity for continued progress in environmental protection.