Topic: Medieval Warm Period

A geologist argues that climate has always changed, citing the Medieval Warm Period (1000 AD) as a time of prosperity that was later "erased" by Michael Mann's hockey stick graph. The speaker claims he was denied an NPR interview because he refused to attribute warming to human activity. He asserts that the current "irrational hysteria" in the media ignores 100 previous studies confirming that historical warming was global and natural.

In a featured audio clip, Dr. Tim Ball explains his defense against Michael Mann's lawsuit, alleging that Mann "rewrote climate history" by removing the Medieval Warm Period from his models. Ball claims Mann grafted modern instrumental temperature records onto cherry-picked tree ring data to create the illusion of unprecedented warming. The segment criticizes the UN IPCC for using the hockey stick graph as a primary tool for climate policy.

A 2006 congressional testimony from a geophysicist challenges the "hockey stick" temperature graph, arguing that the Medieval Warm Period was a real, global phenomenon that modern climate scientists have tried to erase. The witness describes being pressured by NPR to attribute warming to human activity and warns of an "irrational hysteria" in the media regarding natural climate cycles.