While I too appreciate the politeness and reason, I'm afraid I don't agree with several of your basic premises. And, because I think they show what part of the problem is, I'd like to explain what I mean.
I don't buy the notion--the belief, actually--that, "the world was created as filtration system to provide a somewhat stable set of conditions so that life could exist." That's religion, not science--and while it's a pleasant far distance from the sort of weird millenarialist thinking that has led some Christians to say that we SHOULD tear up the planet, because a) the End Times are near anyway, and b) Jesus wants to see that we've been busy, it leads to conclusions that aren't warranted.
When we strip mine a ridge in West Virginia, that is not Nature, not if the word, "nature," means anything at all. It's human action, human design that's at work--and this is very far from simply walking around and exhaling. Moreover, we've jacked around with the environment so that we can procreate in seemingly-endless profusion: that's not, "Nature," either. It's irresponsible human action.
Moreover, there's a false premise about this, "filtration system," business--actually, there are three. The damage--or if you prefer, the effect--isn't simply a matter of producing chemicals that the planet might or might not filter. It's also a matter of literally changing the atmosphere, changing the way the planet absorbs/reflects light, and the wavelengths at which these phenomena occur. Then, there's the fact that we've already torn out or destroyed a great deal of that filtration system--check out stupid destruction of rain forest, check out the proliferation of, "dead zones," in the ocean, check out the erasure of fish species. And last, there are already very good indicators that we have ALREADY grossly overloaded any, "filtering," mechanisms you want to name, the most famous of which are the worldwide changes to coral reef habitats.
Last, this stuff about, "free choice," and "consumer demand." Sure, we should learn to make better choices. Unfortunately, our whole idea of, "choice," and of, "freedom," is now tied up tight with consumerism, waste, and the "right," to use more and more children's toys like Ski-Doos and motorbikes. It's tied up with eating all we want, driving wherever we want, and immediate comfort. So, since our whole idea of "choice," operates within the parameters of consumerism....our "choices," aren't likely to be responsible.
Thanks for the courtesy, and the reason. I don't agree at all.