In "War of the World", published in 2006, Ferguson argued that a combination of economic volatility, decaying empires, psychopathic dictators, racially/ethnically motivated and institutionalised violence resulted in the wars and genocides of what he calls "History's Age of Hatred". "The New York Times Book Review" named "War of the World" one of the 100 Notable Books of the Year in 2006, while the "International Herald Tribune" called it "one of the most intriguing attempts by an historian to explain man's inhumanity to man". Ferguson addresses the paradox that, though the 20th century was "so bloody", it was also "a time of unparalleled progress". As with his earlier work "Empire", "War of the World" was accompanied by a Channel 4 television series presented by Ferguson.