Wildcard:Have you ever even seen one O? ....
What's with the attitude? It's completely unnecessary for discussion. Have you ever seen Everest? No? Then by your same logic you can't say anything at all about it. Hell, you don't even know it exists. No one person can be an expert in all there is to know.
I get the point you're trying to get across. And while it is certainly foolish to think we are completely responsible for our declining environmental quality, it is equally foolish to make natural processes a scape goat for everything. The more we probe and study our environment, the more we find out the true measure of our effect in the planet. Look up pictures of Los Angeles from the 40's and 50's. Sometimes you could not see across the street because of the smog in the air. Catalytic converters and tougher emission laws came about and guess what? Conditions are astoundingly better.
I am of the opinion that as the most able of the species in the planet, we have the responsibility of not abusing everything around us. In fact, I think we have a certain degree of duty to take care of the environment. If not for a polar bear you'll never see, for the generations of humans that are to follow. And I'm not trying to get the sympathy vote by telling you to "think of the children". Think of yourself... what if generations ago, the industrial world just kept spouting smoke into the air without regulation? What do you think will happen if China and India ramp up their industry without restraint?
I truly don't understand how an educated person can see all the evidence that has been accumulated through years of learning the hard way and having to clean our own mess... and doubt that we have a measurable and detrimental impact on the planet.