This article explores the relationship between political and civic participation and the pursuit of sustainability in American cities. Some have argued that cities that exhibit more participation, engagement, and bridging social capital are more likely to pursue policies and programs designed to achieve greater sustainability. Others have posited alternative explanations, especially explanations related to resources, socioeconomic status, and economic growth. Using the Social Capital Benchmark Survey cities-10 of which have extensive sustainability programs, 5 of which have modest programs, and 12 of which have virtually no sustainability programs at all-as the source of comparison, this research finds that cities that are most committed to pursuing sustainability policies do tend to be more participatory places with respect to signing petitions, participating in demonstrations, belonging to local reform groups, and joining neighborhood associations, even controlling for personal income and other factors. [ABSTRACT FROM AUTHOR]