Ecocity Snapshots: Learning from Europe's Greenest PlacesCities are key to our planet's future. Over half of us now live in cities and an estimated 70 percent of the world's total population will be urban by 2050 over six billion people. Will tomorrow's cities continue to waste land, squander resources and contaminate water and air in an escalation of our centuries old war on the Earth? Or will we build and rebuild cities that return us to a balance with nature in ways that are mutually beneficial to people