Human migration. Artwork showing the global history of human migration. Modern humans emerged 200,000 years ago in Africa (centre left). From 70,000 years ago,improved climate (green area) enabled humans to migrate out of Africa (red arrows) to Europe (45,000 years ago) and Asia (Siberia: 30,000 years ago). 60,000 years ago,sea level changes (orange area) opened up the route to Australia via island archipelagos. Ice Age glaciation (blue areas) around 55,000 to 15,000 years ago limited expansion north and east. Once reached,around 15,000 years ago,the Americas were swiftly populated |