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From the following article:

Thresholds for Cenozoic bipolar glaciation

Robert M. DeConto, David Pollard, Paul A. Wilson, Heiko Pälike, Caroline H. Lear & Mark Pagani

Nature 455, 652-656(2 October 2008)

doi:10.1038/nature07337

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Figure 1 - Unfortunately we are unable to provide accessible alternative text for this. If you require assistance to access this image, or to obtain a text description, please contact npg@nature.com

Figure 1

Changes in the isotopic composition of the ocean across the Eocene/Oligocene transition.

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Figure 2

Simulated isotopic composition of snowfall on a glaciating Antarctic continent.

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Figure 3

Simulations of Northern Hemisphere ice sheets for progressively lower values of CO2.

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Figure 4

Model-generated CO2 thresholds for Antarctic and Northern Hemisphere glaciation superposed on a Cenozoic record of atmospheric CO2.

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