Rising seas, peat may have caused Ice Age extinction event

A research paper published yesterday says large ice age mammals may have gone extinct in northern Alaska when grassland turned to peat and rising sea levels covered the Bering Land Bridge.
Download Audio
Alaska and California researchers studied bones of ice age horses, steppe bison and woolly mammoths to determine why they died out.
Lead author Daniel Mann says the Earth’s environment was much more unstable during the ice ages and flipped back and forth every few thousand years.
He says d