Which makes doing something about it all the more difficult.
A century-old idea to rethink how we tax land.
Despite major advances, the world's slum population will likely double to 2 billion by 2050.
The people and ideas reshaping urban life
These iconic buildings are great for a city's character and downtown vitality. But they're quickly disappearing.
And prices are up 50 percent since last week.
Climate change will mean more frequent and more powerful El Niños, say researchers.
Chicago's new plan to keep kids in school longer has been challenged by budget cuts and safety concerns.
A judge rejected they city's proposal to offer gambling revenue as loan collateral.
Americans and Europeans are partly to blame for the smog floating over the Pacific, say researchers.
The rise of the baristas.
International boundaries look a lot different when you judge a country by its greenhouse-gas emissions.
Higher education should be promoted as an opportunity to experience an intellectual awakening.
How globalization has changed the nature of urban development.
A friendly first hearing on Capitol Hill.
We think poverty makes people obese and that obesity makes people poor. It's harder to understand exactly why.
This year, there's virtually no powder on the ground in the drought-stricken state.
Low-income people are 27 percent more likely to be hospitalized for hypoglycemia right before paychecks and benefits come out.