This is the Ice Core Data graph. Note: the T difference between Medieval Warm Period and now, the rise starting early 1800's, long before the Industrial Revolution.
This article, posted before, is really worth reading:
http://wattsupwiththat.com/2009/12/09/hockey-stick-observed-in-noaa-ice-core-data/#more-13939
noughties hottest decade on record, page-45
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