. Greg Mello, secretary, executive director of the Los Alamos Study Group: “Everybody in the world would die. Some people in southern hemisphere might survive, probably not even them, a couple of nuclear weapons could end United States government and economy,” destroying financial markets, Internet. If nuclear exchanges were limited, just ICBM silos and airfields being targeted, fallout would wipe out entire U.S. Midwest.. Nuclear power plants would meltdown, unleashing Fukushima-style disasters, collapse of fragile electronic, financial, governmental, administrative systems. We’d be lucky to reboot in the early 19th century. If enough weapons detonated, collapse of Earth’s ozone layer would mean every form of life that has eyes could be blinded, every mammal, and many plants, would become extinct. U.S. weapons manufacturers stand to make trillions as a result of tensions between Washington and Moscow.