This needs to be read carefully before it gets picked up by GW denialists. The info isn't new, just the packaging and the level of proof.
"'Global warming sceptics could cite my work as evidence that human-generated greenhouse gases played a beneficial role for several thousand years by keeping the Earth's climate more hospitable than it would otherwise have been,' he states in the current issue of Scientific American. However, others might counter that, if so few humans with relatively primitive technologies were able to alter the course of climate so significantly, then we have reason to be concerned about the current rise of greenhouse gases to unparalleled concentrations at unprecedented rates.'"
The Observer | UK News | How prehistoric farmers saved us from new Ice Age:
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