Medieval Warm Period Was Real And Global

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H. Sterling Burnett

Managing Editor, Environment & Climate News at The Heartland Institute

H. Sterling Burnett, Ph.D. is managing editor of Environment & Climate News and a research fellow for environment and energy policy at The Heartland Institute. Burnett worked at the National Center for Policy Analysis for 18 years, most recently as a senior fellow in charge of NCPA’s environmental policy program. He has held various positions in professional and public policy organizations, including serving as a member of the Environment and Natural Resources Task Force in the Texas Comptroller’s e-Texas commission.

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Beginning with the initial publication of Michael Mann’s “hockey stick” graph by the Intergovernmental Panel on Climate Change, if not before, global warming alarmists have tried to write the Medieval Warm Period (MWP) out of the science and history textbooks.

That revisionist effort has been made more difficult by the efforts of two German scientists who have put together an interactive map documenting the massive amount of peer-reviewed literature showing the MWP was both real and global. While they continue assembling research to provide additional data points, so far the Medieval Warming Period Map has 157 markers plotted on it with each marker containing an embedded link to research showing the MWP’s existence for the location.

Geologist/paleontologist Sebastian Lüning, Ph.D. and chemist Fritz Vahrenholt, Ph.D., co-authors of the book The Neglected Sun: Why the Sun Precludes Climate Catastrophe (recently republished by The Heartland Institute), assembled the map, in part to demonstrate the overwhelming evidence the MWP occurred, was global in nature, and produced temperatures as warm as or warmer than today. In addition, they hope the map will spark research concerning why climate models don’t reproduce the MWP and what factors contributed to the MWP at a time when carbon dioxide levels were much lower than at present.