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An atmospheric CO2 record for the past 200 years was obtained from the Siple Station ice core.


Neftel et al. (1985) concluded that the atmospheric CO2 concentration ca. 1750 was 280±5 parts per million by volume (ppmv) and that it increased by 22.5% to 345 ppmv in 1984 essentially because of human factors. Graphs in Friedli et al. (1986) also reported that the preindustrial (pre-1800) CO2 concentration was ~280 ppmv.

There are also charts from other ice core measurements:

We have met the enemy, and he is us — Pogo
by Migeru (migeru at eurotrib dot com) on Mon Jan 28th, 2008 at 10:16:44 AM EST
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