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I think Ria was trying to establish if homo and the controlled use of fire leading to the domination of flora and fauna by 'Man' could be viewed as a hockey stick graph: with there being no appreciable impact for thousands of years with the impact then gradually becoming more and more noticeable? Controlled use of fire would have enabled homo to fend off large land predators and to move and live in colder climates along with cooking food making available more calories increasing brain size and increasing fertility. This being said, if controlled use of fire was used in major way by homo then surely there would be evidence of this in the anthropological/archaeological record? As far as I know, there is evidence of widespread use of controlled use of fire way back: just hearths here and there. I would be interested in a response from Ria and where will I be able to find Ria's critique of JZ as mentioned in JZ's show?