Laurence Smith, professor of earth and space science, the University of California
The world in 2050 will be dramatically different - key "megatrends" of migration and climate change will see new countries rise at the expense of others. How will humans adapt?
Laurence Smith explores the four forces that are changing the world - climate change, rising population, globalisation and resource depletion - and attempts to predict how they will shape the world between now and 2050.
Chaired by David Shukman.