Man-made Global Warming, adjusted to cover whatever will happen in the future to Man-Made Climate Change is a classic example of Group Think. From the Global Warming Policy Foundation by Christopher Booker: Global Warming – A Case Study in Groupthink. A Yale research psychologist called Irving Janis used the term "Group Think" in the title of his influential 1972 Victims of Groupthink. According to Janis there are three rules of groupthink. They are: Rule One. A group of people come to share a common view or belief that in some way is not properly based on reality. Rule Two. Because their common view/belief cannot be subjected to external proof they have to reinforce its authority by claiming ‘consensus.’ The idea is to emphasize that all right-thinking people hold this view and that it is no longer open to challenge. Rule Three: Anyone who disputes this ‘consensus’ must be excluded from the discussion: at best marginalized; at worst openly attacked or discredited. These, Janis showed, were the rules which led to the Pearl Harbor/Korean War/Bay of Pigs/Vietnam War disasters above. They are also, as Booker shows, the rules which explain the current global warming hysteria.