More to Peter’s post immediately below, Chris DeMuth and I adumbrate many of these same distinctions in the very first issue of AEI’s Environmental Policy Outlook, which I founded there in 2002. We call it "practical environmentalism" versus "romantic environmentalism." Worth a read, I think.
As for Peter’s Point #4, I noted in my most recent edition of the Index of Leading Environmental Indicators that one of the most popular books of 2007 among environmentalists was The World Without Us by Alan Weisman, which projects a “thought experiment” about what would occur if human beings were suddenly or somehow removed entirely from the planet. Answer: Nature would reassert itself and remove nearly all traces of human civilization within several millennia. Naturally many environmentalists thrilled to the frisson of the book’s nightmare scenario of the ruin of mankind’s built environment, which Weisman shrewdly gilded with the standard boilerplate about resource exhaustion and overpopulation. I am often asked why so many environmentalists thrill to doom-and-gloom scenarios. The answer I finally arrive it is that it makes them happy. Go figure.