Barcelona

The town of Santa Coloma de Gramanet near Barcelona in Spain wants to do its part in fighting global warming. But the densely packed town - 124,000 people crammed into 1.5 square miles - doesn't have enough land to dedicate tracts exclusively to the wind farms or solar panels that could help ease residents' dependency on fossil fuel.

Matthew Syed in the Times of London:

You're visiting Barcelona and looking for a good place to have dinner. What if you could find a restaurant nearby, and then instantly check with your friends around the world to see if any of them have eaten there? That's one of the services that could soon be available to customers of Garmin, one of the world's largest makers of personal navigation devices.

Completing the Circle: Gas at the Pump, War in Iraq, and Global Warming