Most greens are very wierd. They claim to be against malnutrition and vitamin deficiency, but when it comes to solutions, they are against them(see golden rice). They are also mostly vegans, but when it comes to insulin, they would rather kill lots of pigs instead of scary-scary GMO yeast. Or when it comes to energy production, they rather would choose one with guaranteed dangers(coal has very nasty byproducts of burning) instead of potential.

I think this is probably because they represent a more dangerous and legitimate opposition to the powers that be, and, as a result, tend to be one of the most astroturfed groups on the planet. Couple that with a kind of extremism, where they will oppose golden rice or GMO yeast on the basis of evergreening IP laws (a fair complaint, imo), and then you can kind of see why they keep opposing things that are presented as solutions and keep getting hit with the terminally annoying “well, why don’t you have any solutions, then?” style of criticism.