Indeed, having now been through quite a few courses in "environmental sciences" I can testify that a large number of people at the core of this movement, totally legit environmentalists, are a bit... uninformed, barring that, hugely idealistic. It is supremely frustrating to watch them talk to each other and get all indignant about... unimportant shit. And then they sing the praises of... harmful things.
These type of people tend to have a lot of disdain for more Julian Simon-esque cornucopia-ists that are mostly concerned with doing things like developing technologies that allow our habits to be less destructive. They would rather change the habits. But that is, to be perfectly frank, fucking idiocy.
These poor fools don't understand it would take nothing less than the apocalypse to change the fact that the globalized world is a world of consumers. The West has found the meaning of life - consumption. No band of hippies, even armed to the teeth, will ever change such a thing.
What they do instead, without realizing it, is get people to wonder why people might care so damn much about the environment, hopefully inspiring smart science-y people to do some real shit about it (on this count things are going okay as it stands, as I said there is a lot of encouraging research, and the existence of fields like "environmental engineering" are is cause for hope).
So there you go. Thus my opposition to Keystone XL may be seem a bit abstract but, to the contrary, I think it involves some very real things.
This in fact alludes to what has always been environmentalism's chief weakness - when it's a battle between environmental desolation tomorrow and yummy food or a nice car or a cruise today, everyone knows what human beings invariably choose.