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  • A third explanation agrees that hunting and fire agriculture played a significant role in the extinction, but emphasises that we can’t completely ignore the role of climate. The climate changes that beset Australia about 45,000 years ago destabilised the ecosystem and made it particularly vulnerable. Under normal circumstances the system would probably have recuperated, as had happened many times previously. nike air max tn sale However, humans appeared on the stage at just this critical juncture and pushed the brittle ecosystem into the abyss. The combination of climate change and human hunting is particularly devastating for large animals, since it attacks them from different angles. It is hard to find a good nike air max 90 sale cheap survival strategy that will work simultaneously against multiple threats.
    Just as geologists expect that tectonic movements will result in earthquakes and cheap air max 90 mid no sew volcanic eruptions, so might we expect that drastic social movements will result in bloody outbursts of violence. The political history of the nineteenth and twentieth centuries is often told as a series of deadly wars, holocausts and revolutions. Like a child in new boots leaping from puddle to puddle, this view sees history as leapfrogging from one bloodbath to the next, from World War One to World War Two to the Cold War, nike air max discount shoes from the Armenian genocide to the Jewish genocide to the Rwandan genocide, from Robespierre to Lenin to Hitler.
    This way of thinking is not flawless, but before pointing out some of the holes, it is worth considering the findings.
    Our siblings, according to speculative reconstructions (left to air max 1 griffey right):