The left is equally guilty of being anti-science when it suits them. The anti-vaxxer and anti-GMO crowds tend to be predominantly left-wing, for example.
Anti-vaxxers are a fringe element of the left. Climate deniers are the mainstay of the right. Do not falsely equivalate the two.
Anti-GMO is most certainly not fringe, particularly not in Europe where it's as mainstream a position as climate change denial is in the US, and just as dismissive of science.
In the US, though, it's most definitely fringe, and that's what's pertinent to the discussion in this thread.
Without context, fringe has no meaning, that is what's pertinent. It's about as popular as Scientology (anti-GMO seems to be about twice the anti-vax).