ecopolis 

1. An auto-contradictory term for a city. 2. an ecologically sound city where people use "green" or otherwise renewable energy, reuse materials, and have no waste.

A real ecopolis cannot exist because the very act of displacing nature to build a city, even with a low carbon footprint, is in itself, ecologically unsound.
WOW, this city is an ecopolis, they don't even need disposal service!

ecopolis by ad-92129 March 24, 2011