africa anatolia annum anthropocene asia baltic sea before present blytt-sernander bronze age early pleistocene earthquake eemian stage epipaleolithic epoch fred pearce gelasian global warming holocene impact working group holocene calendar holocene climatic optimum holocene extinction event homotherium hudson bay ice age ice core indian ocean interglacial lake agassiz last glacial maximum late pleistocene little ice age mammoth mastodon medieval warm period megafauna megatsunami mesolithic meteorite michigan middle east middle pleistocene natufian culture neogene neoglaciation neolithic neolithic subpluvial northern europe northern hemisphere older peron ontario piora oscillation pleistocene pliocene post-glacial rebound pre-pottery neolithic a pre-pottery neolithic b quaternary quaternary glaciation quebec saber-toothed cat scandinavia siberia smilodon steppe-tundra tyrrell sea vermont wikimedia commons younger dryas