On hot-button topics such as climate change, vaccines and genetically modified foods, science denial is rampant – and it crosses party and ideological lines. What are the psychological forces that lead people to disbelieve scientific consensus?  Is science denial worse than it’s ever been? How have the internet and social media changed the landscape of science skepticism? Psychologists Barbara Hofer of Middlebury College and Gale Sinatra of the University of Southern California, authors of the book “Science Denial: Why it Happens and What to Do About it,” discuss these and other questions.