"Australia’s best-known historian, Professor Geoffrey Blainey, has challenged the idea that the current level of climate change is either unique or largely the result of human behaviour.
While agreeing the Earth was experiencing a warming period which had been under way for several decades, he said this in no way compared with much greater climate change in human history.
...He said human behaviour “may be part” of the reason for current global warming.However, he said this did not explain how or why the climate had changed more dramatically in the past.
...He added that ice-core samples from Antarctica had shown that as recently as 1173AD - the time of Francis of Assisi - had marked the start of a “horrible” 39-year drought.
“You have to be very careful that you’ve got good explanations for the past as well as for the present,” he said, in relation to climate change..."
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