Think "city," and most of us picture unappealing vistas: gridlocked cars, smoggy horizons, and landfills overflowing with urban debris. Does the trend towards urbanization spell disaster?

More than 300 cities and towns in Central and Eastern Europe will officially participate in Earth Hour 2014 on Saturday, 29 March between 8.30 and 9.30 pm. The countries of WWF’s Green Heart of Europe ...