"Sustainable development in cities such as Copenhagen and Portland is yielding significant environmental benefits ... Growing green is obviously an environmental imperative. Yet the Copenhagen experience shows that it can be a market proposition as well, with a diverse set of economic and fiscal benefits accruing to cities that are at the vanguard of sustainable development ... Both Copenhagen and Portland recognise that urbanisation is the dominant market-shaping trend of the century ... Nurturing what is good - and green - embracing and extending it could provide a platform for economic growth for decades to come." (Quoted from article)