By Alex Aylett
Sustainable cities have been a hot topic for over a decade. But never has there been a time when the challenges and opportunities of sustainability have been so clearly on display. On the one hand, billions of stimulus dollars around the world are being channeled into the green economy. On the other, we find ourselves at the tail end of a year where report after report have made clear that things are much worse that we realized; when did we start talking about 1.4m sea level rise and a 40% reduction in grain yields by the end of the century? Somehow, old classics like putting energy efficient lights on city hall and installing some LED traffic signals just aren't that exciting anymore.
