Nations around the globe are increasingly facing tough challenges when dealing with environmental problems. The limited success of government interventions to protect the environment is a testament to the growing concern about government's inability, or insufficient capacity, to address environmental issues. As a response, scholars note that promoting environmentally responsible behavior (ERB) on the part of the citizenry is critical for the growth and development of efficient environmental governance. However, despite the introduction of a variety of measures by governments to encourage greener practices, influencing citizens' behavior remains a major challenge. Using social capital theory, this article examines the effects of various social relation components on the promotion of pro-environmental behavior in five key public policy areas—recycling, food purchasing behavior, gasoline, energy conservation, and water use. Implications for practice and future research are discussed.