Ice Core from Vostok, Antarctica
¥During last ice age (>18,000 years ago)
¥Temps 6oC colder
¥CO2 levels 30% lower
¥CH4 levels 50% lower
¥H2O levels were lower
¥than current interglacial.
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¥130,000 years ago it was a bit warmer than today
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¥50% change in CO2 associated with 8oC change in temperature
¥6-8oC decrease in temperature produced incredibly different climate: Ice Age