“Dr. Doom” Nouriel Roubini, says the “perfect storm” scenario he forecast for the global economy earlier this year is unfolding right now as growth slows in the U.S., Europe as well as China. Getty Images In May, Roubini predicted four elements – stalling growth in the U.S., debt troubles in Europe, a slowdown in emerging markets, particularly China, and military conflict in Iran – would come together in to create a storm for the global economy in 2013.