Tokyo is the largest city in the world, with around 37 million people living across its metro area. It stretches over 13,500 ...

Among the 10 countries projected to contribute most to global population growth, the U.S. is the only one located outside of Africa and Asia. Still, the U.S. is expected to fall from the world’s third ...

The world's ageing population is reshaping society, with people over 65 soon to outnumber children—here's what's causing it and how leaders are responding.