This three-essay dissertation examines how local governments manage sustainability policies/practices and how these actions are shaped by their organizational, social, and institutional environment. The first essay uses a 2015 Local Government Sustainability Practices Survey to investigate how social media shapes government sustainability plan and how its impact differs from other participatory mechanisms such as public hearings and advisory committees. Drawing from a theoretical framework of individualism-collectivism, the second essay uses data on local governments in the U.S. and Japan to conduct a cross-national comparative analysis. The study finds that governments embedded in a more individualism-oriented culture are more likely to adopt environmental management practices when facing growing external pressures. The final essay uses contingency theory to provide a dynamic view of how sustainability policies might be effectively integrated into the government’s working routines. It finds that the ways through which responsibility delegation affects policy implementation are contingent upon the government’s structural and cultural arrangement. Taken together, the dissertation coincides with the growing interest among public managers and researchers in enhancing government sustainability performance and outcomes. It provides an integrated and comprehensive investigation of the organizational, social, and institutional factors that shape the development and execution of sustainability policies and practices.