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Smart Cities Built On Emerging Tech Is India's Latest Initiative

Temporary tents for devotees are pictured at dusk at Sangam, the confluence of the Rivers Ganges, Yamuna and mythical Saraswa
Temporary tents for devotees are pictured at dusk at Sangam, the confluence of the Rivers Ganges, Yamuna and mythical Saraswati, during the Maha Kumbh Mela in Allahabad on February 13, 2013. The Kumbh Mela in the town of Allahabad will see up to 100 million worshippers gather over 55 days to take a ritual bath in the holy waters, believed to cleanse sins and bestow blessings. AFP PHOTO/SANJAY KANOJIA (Photo credit should read Sanjay Kanojia/AFP/Getty Images)

The world is urbanizing -- and fast. Why are cities so popular?

They’re where the opportunities are. In 2014, the world’s 300 largest cities accounted for 20 percent of the world’s population and nearly half of global output. It is estimated that growing cities could bring nearly $30 trillion a year into the global economy by 2025.

As we rapidly urbanize—and 70 percent of urban growth takes place in emerging economies—understanding cities becomes critical. How can we, for example, improve livability and resource management? Manage disease and sanitation?

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