A comment in one of Ryan's recent posts makes a very convincing point.
"It’s hard to see how, in principle, the view that human beings are just a peculiar species that happened to evolve brains too sophisticated for their own good, could be used to argue against treating the world as nothing more than the means to satisfy whatever ends we deem desirable or necessary. Why not just exult in our good fortune in developing this capacity and go about the business of exploiting the world however we see fit? There’s nothing built into the worldview itself that could prevent this whereas I would argue that the Christian worldview does give us good moral reasons to resist unethical environmental behaviour."
Basically the idea that we should treat the environment in a certain way so as to protect it - for its own sake - is not a natural outcome of the idea of evolution. Why not just work toward getting all the best advantages for ourselves?