Earth’s core cooled to today’s temperature levels.
The two primary landmasses, Laurussia and Gondwana, wander across the North and South Pole where they receive little solar energy; ice sheets grow and shrink.
The proliferation of photosynthetic organisms makes the air breathable.
The end of the Pleistocene is marked by a period of sudden cooling.
The name derives from the alpine wildflower Dryas octopetala, which was found in ice cores from the era.
Europe is particularly affected and temperatures in parts of Greenland are 15 degrees Celsius lower than today.
Paradoxically, the cooling probably stems from prior warming that brought a huge amount of warm fresh water into the North Atlantic thereby weakening the Gulf Stream. (Photo: Reuters)
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