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TRENDS: ATMOSPHERIC CARBON DIOXIDE
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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