Good points.

Watts Up With That?

Guest opinion: Dr. Tim Ball

The Intergovernmental Panel on Climate Change (IPCC) 2001 Report claimed that neither the Medieval Warm Period (MWP) nor the Little Ice Age (LIA) occurred. They created the ‘hockey stick’ graph to prove their point. It wasn’t produced specifically to eliminate those climate periods but to show that today was warmer than “ever” before and that most of the increase occurred in the 20th century. Their nemesis was a graph presented in the 1990 Report (Figure1).

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Figure 1: Graph 7c from the 1990 IPCC Report

The dotted line on the graph is the average temperature of the Northern Hemisphere for the last 1000 years. The ‘hockey stick’ allowed them to claim the 20th century as anomalous. They had to eliminate the natural temperature increase from the nadir of the LIA in 1680. They also rejected historical evidence of the events, but the facts don’t…

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