What is the Most Harmful Pseudoscience?

Which pseudoscience is the most harmful? Climate change denial, right? Or anti-vaxxers? Let's have Dave weigh in on the matter. Watch all my debunks/debates/discussions: http://bit.ly/ProfDaveDebunk EMAIL► ProfessorDaveExplains@gmail.com PATREON► http://patreon.com/ProfessorDaveExplains Check out "Is This Wi-Fi Organic?", my book on disarming pseudoscience! Amazon: https://amzn.to/2HtNpVH Bookshop: https://bit.ly/39cKADM Barnes and Noble: https://bit.ly/3pUjmrn