For the first time in seven decades, there is no single power or alliance of powers ready to take on the challenges of global leadership. A generation ago, the United States, Europe, and Japan were the world's powerhouses, the free-market democracies that propelled the global economy forward. Today, they struggle just to find their footing. Acclaimed geopolitical analyst Ian Bremmer argues that the world is facing a leadership vacuum. The diverse political and economic values of the G20 have produced global gridlock. Now that so many challenges transcend borders--from the stability of the global economy and climate change to cyberattacks, terrorism, and the security of food and water--the need for international cooperation has never been greater. A lack of global leadership will provoke uncertainty, volatility, competition, and, in some cases, open conflict. Bremmer explains the risk that the world will become a series of gated communities as power is regionalized instead of globalized. In the generation to come, negotiations on economic and trade issues are likely to be just as fraught as recent debates over nuclear nonproliferation and climate change. Disaster, thankfully, is never assured, and Bremmer details where the levers of power can still be found and how to exercise them for the common good.