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Reuters The country's almost laboratory-like conditions are a perfect place to measure the effect of human urban development on temperature.
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Charts
Why Bigger Cities Are Greener
Denser, more populous cities are more energy efficient than their smaller counterparts.
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Charts
If Walmart Were a City
Worldwide, the retail giant's stores cover as much land as Miami.
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Why the Federal Government Should Give More Power to Mayors
America's metro areas generate 80 percent of the country's GDP. But so far, that economic reality has not generated a proportional amount of political clout.
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The Global Economic Dominance of U.S. Cities
Collectively, America's cities contribute more to global GDP than the rest of the world's cities combined.
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Maps
Which Cities Tend to Be the Greenest? The Answer May Surprise You
Some metropolitan areas emit much more CO2 than others.
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Best Buy's Big Box Purge
Are the electronic retailer's latest closures a shift away from the giant strip mall model?
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Supporting Local Business with the Muscle of a 'Cash Mob'
At events all over the country, neighbors who want their money to stay local are swarming mom-and-pop shops.
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The Big Fix
Greening an Entire Block Instead of Just One Building
Most smaller commercial buildings can't afford energy retrofits on their own. But what if they banded together?
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Charts
Where the Global 1% Live Now
The most important cities for the ultra-rich, and what it might cost those places.
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Maps
Map of the Day: The Digital Neighborhood
What Foursquare can teach us about how people use a city.
