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JZ simply asks where is the evidence for widespread use of controlled fire? If there was evidence, he would consider it. I have asked Ria on a couple of these threads for her evidence; she hasn't responded thus far. Yes, Wrangham speculates on the impact of controlled use of fire but not dating way back before widespread hunting; but there is no widespread evidence of charred earth etc, just sporadic hearths over the globe. There is evidence of widespread controlled hunting leading to massive declines in large mammals.