Climate: Just goes to show you, it's always something...
A very interesting article.
Saw some stuff on this same subject--deep ocean currents--on the Discovery Channel a while back. A lot of it is quite plausible. The sudden cooling that hit after the last Ice Age was apparently due to melting glaciers in North America breaking up and releasing a huge load of fresh water from an inland sea into the North Atlantic. Bingo--Ice Age is back on again.
As for the source of the new load of fresh water, who knows? One would think that if it was due to increased melting, the runoff would be measurable and identifiable as a source.