In a Nairobi, Kenya, slum, residents used technology to map the area, a key first step in solving problems from waste removal to street lighting. Those with phones can now report problems more accurately.
Environmentalist Ma Jun built a mobile phone app that lets users see whether a Chinese factory or power plant is violating pollution standards. His efforts won him a $1.25 million prize from the Skoll World Forum on Entrepreneurship.
With many of its biggest cities are already bursting at the seams, India is working on its first 'smart' city, with gleaming towers, drinking water on tap, automated waste collection, and a dedicated power supply – luxuries to many Indians.