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Originally Posted by Ace_O_Spades
I just don't get how people can see the release of human made CFC's, CO, and other noxious chemicals released from factories into the atmosphere as having no effect.
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As a follow up to this sentiment, I will state that if you take any closed chemical system, and begin to add substance X to it, you will change the system. Yes, there are some questions as to how well the Earth's ecosystems can absorb / chemically deal with the substances we produce, but the fact is that we now have the technological ability to make changes in our environment at a pace unparalleled in human history. If you're the type of person who believes that some analogue of evolutionary development is a highly probable explanation for the development of our current ecosystems, consider that this process occurred over 100's of thousands / millions of years. The question is simple : can we respond to changes occurring at time scales much faster than the rate at which our bodies / supporting environments are conditioned to respond? If you're not sure of the answer to that question, or if you think that we probably can not, then I feel you might want to start worrying about environmental issues / global warming in a very serious way. If this position is wrong, so what? Everyone laughs at the hyper-reactive idiots. If this position is correct, your ass just got saved.
/as far as I know it, dinosaurs and cavemen didn't have factories.
/re: the question of CO levels 420,000 years ago, I seem to recall that is related to the level of volcanic and other geological activity at time. SOx species were pretty prevalent too. <--- Not a geologist.