The huge contradiction

The Holocene Climate Optimum was a period of time 8000-5000 years BP (before present) where temperatures were from 1 to 2 degrees C warmer than today is.  Even after all of the “unprecedented warming” that we have seen in the last 100 years we are still cooler than the height of this time period.

From Wikipedia: http://en.wikipedia.org/wiki/Holocene_climatic_optimum

So the obvious question is: Why is this time period called the Climate Optimum when it was up to 2 degrees warmer than today AND we are also told by the same climate scientists that 2 degrees of warming would result in catastrophe?

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