Simply repeating a proposition over and over, doesn't increase its veracity. Assertion is not substantiation. Substantiation requires evidence, empirical data and/or the use of logic. As this article points out, the advocacy of global warming reflects a cascade:
- "Availability cascade" has been coined for the way a proposition can become irresistible simply by the media repeating it;
- "informational cascade" for the tendency to replace our beliefs with the crowd's beliefs; and
- "reputational cascade" for the rational incentive to do so.