What is the very worst "denialist" movement in the war on science? Denialist movements in the United States and a few other countries have gotten so powerful that they've managed to turn climate change into a "debate," vaccination into a "danger," and evolution into a theory that's "equivalent" to creationism. Which of these movements is doing the most damage to science?

Photo by USFWS Tom MacKenzie

Those are just the big-name denialist movements. But there are hundreds of other, smaller ones whose goal is to undermine the credibility of science and scientists — often for political ends. Tell us which one you think is doing the most damage, whether that's in your country, your school, or your online community.