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Of course there are no direct measurements. There was not a lot of direct measurement of atmospheric composition before the 19th century, was there?

Oh, and measuring the concentration of gases trapped in ice is a better proxy than growth rates of organisms.

We have met the enemy, and he is us — Pogo

by Migeru (migeru at eurotrib dot com) on Mon Jan 28th, 2008 at 10:59:25 AM EST
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