No doubt Gore-Magnon man was to blame here...after all, Gore-Magnon's tried to alter their living conditions, but still increased their fire output by 10% just before this happened....
History repeats itself...just very, very slowly in this case...
Gore-Magnon man, good one.
The Younger dryas period about 9 to 10 thousand years ago, has been speculated to have been cause when some of the ice dams broke and cold water rushed to the North Atlantic creating the St. Lawrence. All of this cold water prevented the Gulf Stream from completing its warm course to Europe. It took a thousand years to resolve the situation.
Therefore the solution to global warming is to build a sea wall from North Carolina to divert the Gulf Stream. New York would have polar bears and Europe could ski year round.