Urban Sprawl

A massive nature preserve exists inside one of the world's largest megacities, and it's continued existence is vital to the urban area's water supplies and ecosystems.

• By Christine MacDonald

Human health and the environment have suffered from urban planning trends dating to the 1920s, but that trend is starting to reverse.

• By Nathan Collins

Rumors abound that Google is entering into the ride-share race with its self-driving cars. Could that change the face of our cities?

• By Max Ufberg