So you're telling me you don't think people have any effect on the ecosystem because, apparently, it's too big? I don't doubt that it is a big thing, but we are consuming far more than what we put back. If the world agreed with you, then why are so many countries taking action to revert or stabilize climate change?
Even so, why not at least try to turn things around while it's still possible to (since you said we don't have much effect on ecosystems as we are) we eventually will, wont we? Why not try to prevent it then, rather than trying to fix it. My entire point here is that people do (and if not, will) have a huge effect on ecosystems and the planet's welfare, why not take steps to reverse or even prevent it from getting worse by using renewable sources of energy, and taking steps toward being more self-sustaining. It really couldn't hurt, but apparently a lot of people are just morally opposed to the idea, like people who wont buy eco-friendly items for the simple reason that they say "eco-friendly".