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| The Last Glacial Maximum |
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| (21,000 Years Ago) |
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| q | Seasonal insolation levels |
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| 21,000 years ago were nearly |
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| identical to those today. |
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| q | The only factors that can |
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| explain the colder and drier |
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| glacial maximum climate |
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| 21,000 years ago are: |
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| (1) the large ice
sheets |
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| (2) the lower values of |
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| greenhouse gases. |
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