This is a bit of a loaded question. In my career as an environmental engineer, I have worked as a consultant in a firm that serves the fuels, power, and mining industries. Clearly these are industries that consume or extract natural resources. That, in itself, is opposed by some people. Some of my clients expected that we would use any "grayness" in rules and regulations to their advantage. Hence, much like a lawyer, our job was to advocate for our client, even if we thought they could do more to protect the environment. As a student, I pursued environmental engineering with the expectation that my work would necessarily benefit the environment. In reality, that wasn't always true. Having said that, you could choose to apply your environmental engineering skills as a regulator, an environmental advocate, or in a company that develops technologies that protect or clean environmental media. If environmental engineering excites you, don't abandoned your pursuit of a degree; just be mindful of where you go to work and have a clear expectation of the job and who/what you'll be serving.