Researchers are experimenting with using LEDs to grow algae in abandoned mines to be used for biofuels.
Nov 11, 2009 Scientific American
As the recession digs in, cities across the country are left with large swaths of abandoned or vacant places. Can these cities shrink gracefully? Do they even need to? Vote on ideas submitted by the Planetizen community, or suggest your own. Exclusive
Jun 29, 2009 By
Struggling cities are increasingly looking at the idea of bulldozing vacant properties and "shrinking". But two columnists argue it might not be such a good idea.
Jun 23, 2009 Citiwire