Per Edman wrote:
2010/1/25 Michael <[email protected] <mailto:[email protected]>>

      Really? How then did the surface temperature rise during the
    Medieval Warming period? And numerous times before.


Depends on which times you mean. Proxy data and historical records seems to indicate the MWP was limited to the north Atlantic or at least not globally synchronous. As requested earlier, if you have any more specific information about your claim, feel free to share it.
Proxy climate data and historical records indicate nothing. Human interpretation of these data yield conclusions. And no, the Medieval Warming Period was not limited to the North Atlantic. As I stated earlier I documented it in tree rings from Alaska and Siberia, and in the archaeological record of those who migrated from Siberia to Greenland during this period. My data are included in the climate record of the past 2500 years.

   Hayduke

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