A person who does not believe in psychics is called a "skeptic".
Article: History will condemn climate change denialists
A person who is skeptical of the claims of global warming activists gets called a "denialist." This is a word that the Guardian [UK] reserves for people who deny the Holocaust or deny that vaccinations work and are not harmful or that deny the scientific explanation of how HiV causes AIDS.
"History will condemn..." It is Marxist claptrap to believe that history has a single direction, that the enlightened know that direction, and that their opinions will be validated by it.
That is a religious stance: faith proving one's righteousness.