Yeah, what JA said.
Basically, natural process or no, we can't avoid contributing to it, being part of the closed environmental cycle as we are. At the same time, it's over-hyped, because the planet fundamentally doesn't care what we do - it's just going to go on its merry way with or without us. We're NOT going to destroy "the planet"...at worst, we'll destroy ourselves.
But, as JA also said, there's nothing wrong with being responsible for the environment, even if global warming is a scam. It's pretty damned stupid to sh-- where you sleep, at the very least...