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CO2 and the end of the last ice age

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    CO2 and the end of the last ice age

    This is a quote from the abstract of a paper in the lates edition of Nature
    Here we construct a record of global surface temperature from 80 proxy records and show that temperature is correlated with and generally lags CO2 during the last (that is, the most recent) deglaciation.
    The article is making the links between carbon dioxide levels, temperatur and ocean circualtion at the end of the last ice age.

    These observations, together with transient global climate model simulations, support the conclusion that an antiphased hemispheric temperature response to ocean circulation changes superimposed on globally in-phase warming driven by increasing CO2 concentrations is an explanation for much of the temperature change at the end of the most recent ice age.
    You have to pay for the whole article but it shows that rising carbon dioxide levels preceded the temeperature rises at the end of the last ice age as opposed to the other way round, as is often claimed. Studies showing that carbon dioxide levels followed temperature rises were looking at local temeperatures in the antarctic, where the ice cores were taken:
    if you reconstruct temperatures on a global scale – and not just examine Antarctic temperatures – it becomes apparent that the CO2 change slightly preceded much of the global warming, and this means the global greenhouse effect had an important role in driving up global temperatures and bringing the planet out of the last Ice Age
    How does this compare to today?

    CO2 was a big part of bringing the world out of the last Ice Age, and it took about 10,000 years to do it. Now CO2 levels are rising again, but this time an equivalent increase in CO2 has occurred in only about 200 years...

    Actually, the last ice age (well, a little one anyway) ended in the 1700's. I forget the exact year...but the "year without a summer' resulted from the ash cloud produced by the explosion of Krakatoa. The Thames in London froze solid for most of the year, and the NE US had snow on the ground year round.

    CO2 plays a part, yes, but there are other things that have a greater effect. Here in Iowa, we had 2 years of really bad, record snow fall winters following the Pinatobu (sp?) eruptions a few years ago. This year, we got by with a total of less than 20 inches so far.