(FILES) A file picture taken in 1971 shoWith an estimated 17,000 nuclear weapons in the world, we have the power to exterminate humanity many times over. But it wouldn’t take a full-scale nuclear war to make Earth uninhabitable, reports Live Science. Even a relatively small regional nuclear war, like a conflict between India and Pakistan, could spark a global environmental catastrophe, says a new study.  “Most people would be surprised to know that even a very small regional nuclear war on the other side of the planet could disrupt global climate for at least a decade and wipe out the ozone layer for a decade,” said lead author Michael Mills, an atmospheric scientist at the National Center for Atmospheric Research in Colorado. MORE