Cool War: The Future of Global Competition (2013) is about the relationship between the United States and China, as "the world's two biggest economies are fated to remain geopolitical frenemies, locked in a chilly embrace necessitated by economic interdependence but made tense by constant military and political rivalry in Asia and, increasingly, the rest of the world." As each side vies for supremacy, Feldman warns, the Cool War has the potential to become a hot war.