Iain Martin talks to Helen Thompson to discuss her new book Disorder: Hard Times in the 21st century.

Disorder is a groundbreaking study, explaining how energy and the battle for resources shaped politics and statecraft in the 20th century. It puts the world since 9/11 into new context and shows how the race to a post-carbon economy is going to bring further disruption.

Helen Thompson is a Professor of Political Economy in the Department of Politics and International Studies at Cambridge University.