Why was the medieval warm period not reflected in the Hockey stick graph?

Surely a blunder as obvious as this could not have been made by objective science. The medieval warm period is well established history. For farming to have occurred on Greenland as is documented wouldn't it have to have been warmer than the present. There isn't much farming there today after all. Is the... show more Surely a blunder as obvious as this could not have been made by objective science.
The medieval warm period is well established history.
For farming to have occurred on Greenland as is documented wouldn't it have to have been warmer than the present. There isn't much farming there today after all.
Is the hockey stick graph reliable?
It appears thousands of reputable scientists have stake their reputation on it.
Update: Mann's hockey stick (Gorbal warming)
Wiki is a left wing propaganda machine.
Information from these sites should be highly scrutinized.
Update 2: What are you putting in that Tea?
Update 3: facism was successful!
Update 4: Who endorses this graph Ken? It is the holy grail hysterically speaking.
Update 5: Jerry, I hope not. I think it's similar to the left wing agendas promoted within the mainstream media and in academia. Their desire is to control the flow of information.
Update 6: gncp has the nerve to mention accuracy.
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