Climate change initiatives do not only exist on the international, national or state levels. Communities across the United States are searching for methods to effectively control greenhouse gas emissions. Municipal strategies include initiatives in transportation, solid waste, zoning codes and land use policies, urban forestry, renewable energy, and energy-efficient building. In addition, collective initiatives by municipalities, such as the U.S. Mayors Climate Protection Agreement and the Local Governments for Sustainability (ICLEI), are coordinating local efforts both nationally and internationally. Active municipal programs that address climate change exist both in large cities, such as New York City and Portland, Oregon, and in smaller towns such as Greenburgh, New York.