C40

C40 is a planning group for 59 cities engaged in efforts to combat climate change.  A major focus of C40 is equipping old buildings with energy-efficient features.  In the U.S., the average building - - whether skyscraper, house or church was built in the 1970s.  For example, heating hot water accounts for 17% of the energy used by buildings in the U.S., according to the Department of Energy.  C40 has partnered with the World Bank to ensure funding for such retrofitting projects, among other climate action plans for cities.