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