A Wikipedia overview.
The distinction between an eco-municipality and other sustainable development projects (such as green building and alternative energy) is the focus on community involvement and social transformation in a public agency as well as the use of a holistic systems approach. An eco-municipality is one that recognizes that issues of sustainability are key to all decisions made by government. Many eco-municipality projects also incorporate the Natural Step into their change processes.
the North American Eco-Municipality Network (NAEMN).
“Sveriges Ekokommuner” (SEkom), in English “The National Association of Swedish Eco-municipalities”.
See also the more general topic of sustainable cities.