Vanessa Keith explores some simple yet radical ways to retrofit our urban building stock to address a chief cause of climate change: tropical deforestation.

Phantom Projects share aspect of unreality; not only were they visionary at the time they were introduced, but also unattainable.

Irene Cheng and Brett Snyder share the inspiration behind their iPhone app and pose questions sparked by their research. Read their story and then go tour the unbuilt city.

A look at the 2008 ideas competition launched by the Design Trust for Public Space and the Grand Army Plaza Coalition to generate new visions for New York’s “greatest unrealized asset.”