“The Urban Challenge” was a chapter in the 1987 Brundtland report, Our Common Future. The issues remain depressingly familiar for Rio+20. Urbanization has continued around the world, sometimes diminishing rather than enhancing social and environmental capital. Urban populations then 2 billion are estimated to have reached 3.5 billion. But three unforeseen new factors have changed the world's urban landscape since the 1980s: globalization of transportation, information technology, and clean energy.
The Urban Challenge
Science 15 June 2012:
Vol. 336 no. 6087 pp. 1396-1397