Musings of a Madman
... well, the answer to the 1st question is by analyzing trapped air pockets in ice dating back to that time .. the antarctic ice forms a new layer each year, much like a tree does, so you can study each past year by the molecular content of the air pocket .. the air pockets reveal the carbon dioxide content, and the average air temperature can be determined from this air content as well. And, since they determine temp and co2 this way, they don't need to rely on old data from the past (2nd question).This was all described in the movie, so only people who actually saw the movie would have known this .. I can see why you think this could all be inaccurate, and that its good that we did not respond to the fears about an ice age coming, back in the 70's (fortunately, it went away with the white dog poop) .. but this time its different .. the data is overwhelming .. yes, its possible that its not as bad as Al Gore wants us to think, but there is clearly a warming trend going on now, and unlike the 70's, there's a serious amount of global evidence of this .. it only makes sense to back off on contributing to it, regardless of how much that may seem, and at least until the poles start freezing up again .. I'm only 11 feet above sea level, and I like it here .. I don't want to have to move to the top of a mountain .. besides, there aren't any in Florida ..
We're gonna need a bigger boat...
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