Nothing is done. Everything in the world remains to be done or done over. The greatest picture is not yet painted, the greatest play isn't written, the greatest poem is unsung. There isn't in all the world a perfect railroad, nor a good government, nor a sound law. Physics, mathematics, and especially the most advanced and exact of the sciences are being fundamentally revised. . . Psychology, economics, and sociology are awaiting a Darwin, whose work in turn is awaiting an Einstein.

-Lincoln Steffens

Building Sustainable Cities - And A Sustainable Future - Will Need Open Dialogue Among All Branches Of National, Regional And Local Government. And It Will Need The Engagement Of All Stakeholders - Including The Private Sector And Civil Society, And Especially The Poor And Marginalized.
— Ban Ki Moon - Secretary-General Of The United Nations