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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