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JohnMK · Oct 16, 2006, 10:18 pm

I'll go out on a limb here and assume you're asking for this type of material. You are correct, there have been relatively HUGE fluctuations in the level of CO2 going back hundreds of millions of years, up to probably around 4000 ppm IIRC.

The evidence for the past several hundred thousand years is more concrete; fewer variables are unaccounted for, so these data are more illuminating on our present situation.

TRENDS: ATMOSPHERIC CARBON DIOXIDE

Oct 16, 2006, 10:18 pm	#12 (permalink) (top)
JohnMK Laissez-Faire Location: Seattle Posts: 539	I'll go out on a limb here and assume you're asking for this type of material. You are correct, there have been relatively HUGE fluctuations in the level of CO2 going back hundreds of millions of years, up to probably around 4000 ppm IIRC. The evidence for the past several hundred thousand years is more concrete; fewer variables are unaccounted for, so these data are more illuminating on our present situation. TRENDS: ATMOSPHERIC CARBON DIOXIDE Last edited by JohnMK; Oct 16, 2006 at 10:39 pm.