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  Holocene Temperature Variations

  Can someone help me out on interpreting this graph?  It appears the heavy black line is considered to represent the global average temperature, and all data is plotted as difference from a datum point labeled "zero."  The high point on the trend line, at a difference of about +0.3 deg., occurs a little more than 7500 years ago.  The overall trend has been downward ever since, bottoming out maybe 600 years ago at -0.5 deg and rising pretty steadily every since.  The trend seems to clearly show the medieval warming period and the little ice age that the skeptics claim are ignored in the hockey stick model.  But if the trend shows steady warming for 600 years, and we're just now back to -0.25 deg., doesn't it seem likely that non-anthropogenic factors which have been responsible for warming over most of the last 600 years are still in play?  And while the graph definitely shows an ongoing upward trend, with the exception of the the last 600 years the most recent temperature is still lower than almost every value for the last 7500 years.  What's the basis for statements that we're breaking records?    Am I just mis-reading this graph somehow?

  Bob Wilson

  On 'Global warming stopped in 1998'--Only if you flagrantly cherry pick posted 2 years, 11 months ago 170 Responses