Both New Delhi and Mumbai have the distinction of populations exceeding 10 million ... and one of the biggest cities in the world. Bengaluru, often called the Silicon Valley of India, is a hub ...

Chad, in central Africa, is the world’s most polluted country, while California has the worst air pollution in North America, ...

Cities are laboratories for innovation. They're also the lifeblood of our democracy, acting as the focal points for social movements and civil rights wins that are playing out in real-time.