Tim Halbur

Famed architect Leon Krier says that "metropolitan development is a mistake and is unsustainable," calling for a more polycentric approach.

In the capital city of Astana, temperatures can drop to -40F. Kazakhstan's president Nursultan Nazarbayev says the city is fighting the cold by building an entirely indoor city, under a dome 2 kilometers across.

Essayist and photographer Aisha Sloan revisits the Los Angeles neighborhood of her childhood to examine Modernist architecture and its correlation to segregation.

London-based consulting company Mercer released their yearly rankings of the 25 most liveable cities, and no American cities make the grade. Vienna is number one, and Vancouver takes fourth.

When thinking about the right way to invest in renewable energy, it's important to realize the different land use impacts of solar, wind, biofuels, along with coal and nuclear, says Clinton Andrews of Rutgers University.