The world is undergoing a period of unprecedented change, characterised by a rising population, rapid economic growth, the spread of globalisation, pressure on the environment and continuing social, political and cultural divisions.

The UN estimates that half of the world's population, 3.2 billion, now live in cities, compared with 13% (0.2 billion) in 1900, 29% (0.7 billion) in 1950, and 37% (1.5 billion) in 1975.

Climate change is a problem all businesses have to face. It also presents a test for how they will use the power to create a sustainable future.