 Some forms of pseudoscience have as their main objective the promotion of a particular theory of their own, whereas others are driven by a desire to fight down some scientific theory or branch of science. The former type of pseudoscience has been called pseudo-theory promotion, and the latter science denial(ism) (Hansson 2017). Pseudo-theory promotion is exemplified by homeopathy, astrology, and ancient astronaut theories.  The term “denial” was first used about the pseudo-scientific claim that the Nazi holocaust never took place. The phrase “holocaust denial” was in use already in the early 1980s (Gleberzon 1983). The term “climate change denial” became common around 2005 (e.g. Williams 2005). Other forms of science denial are relativity theory denial, tobacco disease denial, hiv denialism, and vaccination denialism.