Sustainable cities, ecocities or ecopolises constitute settlements which consume less natural resources and try to make them renewable while developing socially and economically.
Richard Register introduced the term "ecocity" in his 1987 book "Ecocity Berkeley: Building Cities for a Healthy Future".
Paul F. Downton, the architect who later founded Ecopolis Architects, is another trailblazer in the concept of sustainable cities.
Other words you might be interested