| One Reason: Higher CO2 Level |
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| q | CO2 level was higher 100 Myr |
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| ago. |
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| q | Although higher atmospheric |
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| CO2 level can account for the |
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| warm climate 100 Myr ago, |
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| this mechanism alone can not |
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| explain the extremely small |
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| equator-to-pole temperature |
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| gradient at that time. |
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