Most people in Europe, the Americas, and Oceania live in cities.
In Africa and Asia, most people don't live in cities, but rather in rural areas.
All that is about to change. A massive population shift is expected, and billions of people will need a new place to live and work in cities.
Cities in emerging countries must learn how to cope with this mass migration of people.
City leaders are wondering how they can make this sustainable.
The future and availability of cities is a big deal.
Science, city builders, and managers must understand how to model cities as a living entity.
Big Data, machine learning, social media, and Internet of things all play a role.