Question

Around 6200 bc, evidence from the Greenland ice core shows that global climate went into a sharp cold phase that lasted for around 200 years. The cause is thought to be:
a) the sudden emptying of Lake Agassiz, a vast freshwater lake on the US/Canadian border, into the North Atlantic
b) the extinction of the megafauna
c) huge increases in forest burning by humans
d) a sudden and dramatic change in the orbit of the Earth round the sun
e) natural cycles in the climate of the Earth

Answer

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