New Scientist
Image: TFM
Some 15,000 years ago, a small band of pioneers stood on the threshold of a new world. To the south were the Americas, 40 million square kilometres of virgin territory including wide-open prairies, dense rainforests and high mountain chains. An epic journey was about to begin – but only because a remarkable adventure had just ended.
Before these original American frontiersfolk ventured south, their forebears had spent millennia scratching a living in the desolate regions just south of the Arctic circle. Once they had arrived in the north, global temperatures plunged and the climate became bleaker still. Read more on newscientist.com…
