The rise of autonomous war machines is outpacing policies and technological countermeasures, weapons and robotics experts warned last week at the World Economic Forum. Autonomous weaponry potentially is a $20 billion industry that has taken root in 40 countries, said BAE Systems Chairman Roger Carr. He was one of four panelists at the session titled "What If: Robots Go to War?" The others were Angela Kane of the Vienna Center for Disarmament and Non-Proliferation, robot ethics expert Alan Winfield, and UC Berkeley professor Stuart Russell.