Besides being a lead author on several reports from the Intergovernmental Panel on Climate Change, Dr. Alley led one of the groups that first discerned in Greenland's
ice layers how the climate has seen extraordinary jogs in temperature, particularly
shortly after the end of the
last ice age.
Global temperatures began warming again following a much shorter «Little
Ice Age» which
lasted from about 1350 until
shortly after General Washington's troops spent a brutally cold winter at Valley Forge in 1777, and Napoleon's beat a brutally frigid retreat from Moscow in 1812.