While this might confuse most people, the motive for the sign is all too clear to world-renowned climate researcher David Keith. — David Keith, Harvard scientistThe Harvard scientist was amazed and, admittedly, a little frightened when he saw the billboard. The billboard promotes a conspiracy theory about governments secretly spraying chemicals from the sky to sterilize people. "I suppose if you really believe it, then it's rational to want to kill me because if you really believe it, then you believe I'm some mass murderer orchestrating the death of the human race," he said in an interview with CBC News. The chemtrails conspiracy theory is based on the belief that those trails really are chemicals or other harmful materials that governments are deliberately spraying.

Source: CBC News August 25, 2016 13:01 UTC