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Changes in ocean circulation can have a strong impact on regional
climates and can occur quite rapidly, as we may discover later this
century. Ice age climates are even more variable, with the younger
Dryas cooling setting in over less than five years in the Northern
Hemisphere, cooling winters several degrees C, while leaving summers
unaltered. There is some reason to believe that this event was set
off by volcanic cooling. But at the moment that's just an idea.
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Solar. While this doesn't seem to ever amount to much, it does exist,
and if it adds to the above, which it may have done in the little ice
age, it can be significant.
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But none of these processes is active now.
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