According to an article on the Intelligencer website, tRump says that his "natural instinct for science" convinces him that the science on climate change is incorrect.
I want to write something serious about this, but seriously... I will say that this stage of our attitude toward science has been brought to us, in part, by postmodernism, which in some of its guises argues that science is just another subjective way of knowing about the world. But it's also been brought to us by the US mode of enculturation we call independence training, which encourages everyone to believe that they, independently, can have an opinion about something that's as valid as anyone else's.
And to be fair, while we probably do have an internal program for making sense of the world, it's only the beginning of science. Our IT-driven educational system, supported by the larger culture, mostly beats it out of us by middle or high school. Some manage to overcome this; not tRump, though.