| Historical Climate Changes |
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| q | Climate changes over the last 1000 years |
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| have been smaller than those over tectonic, |
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| orbital, and glacial-age millennial time |
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| scales, never exceeding 1°C
on a global |
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| basis. |
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| q | Climate changes over the last several |
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| thousand years have been highly variable |
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| in pattern from region to region. |
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