What is a possible explanation for the Younger Dryas Cooling?     A dramatic change in sunspot activity reduced incoming solar radiation     The route of meltwater from the melting Laurentide Ice Sheet changed and slowed deepwater formation in the North Atlantic     Human agriculture spread out from the Fertile Crescent at this time and resulted in declining CO2 in the atmosphere     The monsoon system changed in the tropics, resulted in the expansion of wetlands and large methane release to the atmosphere

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