The story of golden rice sums up the enviro-nuts pretty well:
http://en.wikipedia.org/wiki/Golden_rice
This engineered strain of rice could have saved millions of lives and prevented hundreds of thousands of cases of blindness caused by vitamin A deficiency every year. The developers of the rice voluntarily agreed to forgo their intellectual property rights in order to make the rice available to impoverished people as a humanitarian gesture.
But it never happened, because the anti-GM luddites had a coniption fit. These assholes are blocking use of a food that could improve millions of lives, because of some nebulous, undefined fear of "franken-foods". They don't have any scientific evidence to support their fear of golden rice, but they're willing to condemn millions of third world children to preventable blindness regardless.