Cities to Host Half of Humans by End of 2008
The Japanese capital is the world's largest and most densely populated city
In many wealthy Western nations, like the United States, up to 70 percent of people live in metropolitan areas
Beijing, China
China is the world's most populous nation and is currently experiencing a rapid social transition.
Shanghai, China
Farmland has been swallowed by skyscrapers and ribbons of freeway unravel across the horizon as Shanghai's frenzied building boom continues
New Delhi, India
In New Delhi, one of two Indian megacities, 95 percent of the metropolis has no system of formal garbage collection and relies instead on ragpickers
Mumbai (Bombay), India
Dharavi is a one-square-mile (three-square-kilometer) slum in the heart of bustling Mumbai, India's other megacity
Cairo, Egypt
People have lived in Cairo for some 6,000 years, but explosive growth is relatively modern
Lagos, Nigeria
The city's population is expected to reach 18 million in the next two years
