How do you change the minds of climate deniers and people -- say the President -- who doubt the scientific process in general? We ask a philosopher of science for some answers.

Lee McIntyre is a Research Fellow at the Center for Philosophy and History of Science at Boston University and a Lecturer in Ethics at Harvard Extension School. He has written books about defending science and fighting back against “alternative facts.”

Now, McIntyre is out on the road talking to flat earth theorists and people who don’t accept current climate science.