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Medieval Warm Period and Hockey Stick Revisited: Were global temperatures during the beginning of the last millennium as warm as today? New study says ”yes.“ But what does it mean? by erica — last modified Aug 31, 2009 12:03 PM — filed under: hockey stick, Medieval Warm Period, climate change, oceans, Pulse of the Planet, global warming, Michael Mann, Delia Oppo, temperatures, carbon dioxide emissions, U.S. National Academy of Sciences — Relevance: 1%