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| So how
might orbital variations cause ice ages? |
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| One idea
is that since the ice sheets melt the most |
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| in the
summertime, the sunshine during this time |
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| of year
might be important for determining ice |
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| volume. |
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| But
exactly how orbital variability is translated into |
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| the huge
observed climate changes remains one |
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| of the
major unsolved problems of climate.
Any |
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| satisfactory
explanation will probably involve the |
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| dynamics
of the ice sheets themselves. |
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