I¹m always wary of claims (p3) that we are entering a period of unprecedented warmth. I do not know what the mean global temperature was in the Holocene climatic optimum, but research suggests tropical sea-surface temperatures some 5-6 degrees higher than present. Even a smaller change would of course be catastrophic for many societies today, but unless there have been serious comparisons between today and the mid-Holocene and we can say with confidence that anthropogenic warming scenarios exceed such palaeoclimatic conditions such claims may come back to haunt us.
Exxon Didn’t Know, And Neither Did Anyone Else
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