But not all residences were created to be equally environmentally responsible raising questions about how sustainable the development truly is as a whole.
"The battle for sustainabledevelopment, for delivering a more environmentally stable, just and healthier world, is going to be largely won and lost in our cities, " said Klaus Toepfer, Unep's executive director.
It combines natural and social sciences, economics and education to improve human livelihoods and safeguard natural ecosystems, thus promoting innovative approaches to economic development that is socially and culturally appropriate and environmentallysustainable.