This chapter describes why innovative, local level policies are growing in the United States. It discusses why localities are ideally suited for sustainability planning, including examples of successful city‐led sustainability action. Many of these examples are from New York City, which is one of the best examples of urban revitalization and resiliency when it comes to sustainability. Cities can influence climate change mitigation and adaptation through their responsibilities over land use zoning, transportation, natural resources management, buildings, and waste and water services. To improve urban air quality, cities are attempting to reduce pollution by targeting two main sources of emissions: buildings and transportation. Land use and municipal zoning policies can better support community health, wellness, and equitable development. Sustainable community design can protect ecosystems, ensure health and safety are prioritized, support walkable neighborhoods, and increase economic vitality.