In the Beginning it was a Consensus Statement of the Medical Doctors of America:

… and Hollywood Stars were completely agree with them:

See also: Hollywood cut secret deals to promote smoking .  Report: Tobacco companies paid Hollywood stars to promote smoking

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Now there is the same “scientific consensus” on climate change

The “consensus” was built around the mystical graph that was called a  “global warming hockey stick“:

It does not matter that independent scientists “have uncovered a fundamental mathematical flaw in the computer program that was used to produce the hockey stick“, because the Hollywood produced an impressive movie about this theory. It was called “An Inconvenient Truth” and promoted the “stick” as a truthful theory:

Former vice president Al Gore, as a screenplay of this movie, nabbed an Academy Award for best (see above) documentary. Although the Oscar actually went to director Davis Guggenheim, Gore gave an acceptance speech:

Secretary of State John Kerry declared, that according to his estimations “at Least 98, 99% of All Scientists in Our Country’ Believe in Climate Change“, and President of the United State concluded: “The debate is settled. Climate change is a fact“.