Could you please quantify "frequently", and document the claim?
Greens get caught red-handed committing scientific fraud.
http://www.junkscience.com/
"THIS YEAR something quite unprecedented has happened in the world of physics. In two separate, highly respected research laboratories, senior researchers were dismissed for publishing faked results." (Socialist Party magazine, BTW)
Now I will admit that the worst perpetrators of hoaxes and junk science are in climatology and public health. But when areas who make insane, overblown, unrealistic claims then get themselves in one of the biggest frauds in recent years, we are leaving the realm of science and entering a huge con game.