Why we should worry about a nuclear winter

On 16 July 1945, the world witnessed the mind-boggling destructive power hidden inside a nuclear bomb. After seeing the catastrophic might of the bomb at the Trinity Test Site in Alamogordo, New Mexico, Robert Oppenheimer, director of the Manhattan Project, famously invoked a quote from the Bhagavad Gita, "Now I am become death, the destroyer of worlds."