The world power structure is about to have a vacancy. At the top.

The United States is in financial crisis and can't hold onto the reins of the G-20. But China has no interest in international leadership, Europe is trying to save the euro, and emerging powers like Brazil and India are focused on domestic development. No government has the time, resources or political capital needed to take an international lead.

Welcome to the G-Zero world, in which no single country has the power to shape a truly global agenda. That means we are about to see 20 years of conflict over economics, finance and climate change.

Bestselling author and strategist Ian Bremmer reveals how world powers are rapidly turning into gated communities, locked in competition. Who will prevail?