The New England Municipal Sustainability Network (NEMS Network) is a consortium of New England cities and towns that collaborate to build more sustainable communities consistent with the goals of the Global Covenant of Mayors. The Network empowers its members to identify, develop, implement, and manage programs and policies in each member community that achieve high levels of energy efficiency and energy resource sustainability and prepare for the impacts of climate change. It accomplishes this by: 1) providing ongoing peer-to-peer support, training and sharing of resources; 2) arranging for exceptional students from across the U.S. to work on key projects in member communities and 3) identifying opportunities and organizing cooperative multi-community initiatives that reduce GHG emissions in member communities or harden member communities from the impacts of a changing climate.