If people want to have a serious discussion about this, they need to start by getting rid of the sweeping generalisations and meaningless labelling. I don't much care for the term 'greenie' because it diminishes and trivialises those who genuinely care about environmental issues. Labelling people in such a way also obscures the seriousness of their commitment.
There are people, unfortunately, who attach themselves to causes as a way of feeling part of something bigger than themselves, but who have no real understanding of the thing they are promoting or real belief in it. This is just part of human nature. These people are not environmentalists. They are opportunistic parasites. Learn to tell them from the real environmentalists before coming along with scattergun criticisms.