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q |
Climate changes over the last 1000 years have been
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smaller than those over tectonic, orbital, and
glacial-age
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millennial time scales, never exceeding 1°C on a global
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basis.
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q |
Climate changes over the last several thousand years
have
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been highly variable in pattern from region to region.
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q |
Over much of this interval, records of climate are based
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on geochemical and geological indicators stored in
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annually layered archives: mountain glaciers, tree
rings,
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and corals.
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q |
Also available are historical observations recorded by
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humans.
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