I haven't really drawn a line in the sand myself but my geology professor firmly believes that all the worry about CO2 is madness. In class today he started talking about the issue and I jotted down a couple of things he said. These are all rough paraphrases:
Water vapor is actually our most prevalent greenhouse gas and accounts for about 98% of the atmosphere's heat holding capacity.
The reason that CO2 has been targeted by politicians is because water vapor ain't going anywhere anytime soon.
Of the remaining 2%, CO2 represents about half, i.e. CO2 is only responsible for 1% at most of our atmosphere's heat retention capabilities.
Mankind has been around for the lowest CO2 levels in geologic history.
360-260 million years during the paleozoic era CO2 represented about 6% of the earth's atmosphere and this period was a time of glaciation, not melting or warming.
Today, CO2 represents roughly .039% of earth's atmosphere or 390 parts per million.
Burning of fossil fuels has not yet doubled atmospheric CO2 since the start of the industrial evolution.
Given that we aren't even that CO2 isn't even that close to being 1% of the atmosphere and given that it was 6% CO2 during a time of glaciation it seems silly to think that the CO2 that humans are putting back into the atmosphere is going to put us on a runaway course of global warming that's going to destroy civilization and the environment.
Just to reiterate, I myself don't take a position on this matter. I'm all down for solar power regardless but I'm not a scientist, I haven't looked at or understood the totality of the geologic or climate records. So I really don't know. Just wondering what the global warming affirmers have to say about these sorts of things.
"I don't envision a single thing that, when developed & cultivated, leads to such great benefit as the mind. The mind, when developed & cultivated, leads to great benefit."
"I don't envision a single thing that, when undeveloped & uncultivated, brings about such suffering & stress as the mind. The mind, when undeveloped & uncultivated, brings about suffering & stress."