Peeps say scientists are wrong by stating they were wrong 600 years ago as well...

I'm sure everyone of you have your own opinions on Global Warming. I'm not going to go out and tell the world my opinion, mainly because I don't have one! But even if I were against the scientists saying that it was real, I wouldn't go out and make a fool of myself and say that scientists were wrong when they said that the world was flat... which they failed to mention was stated over 600 years ago!