Climate Scientist David Deming Testifies on Alleged Erasure of Medieval Warm Period from Historical Record
Key Facts
The Medieval Warm Period, which occurred from ~1000-1300 AD, was a time of warm weather bringing prosperity, knowledge, and art to Europe. It was well-recognized in literature until contradicted by Mann et al.'s 1999 "hockey stick" reconstruction, which Deming called an artifact that made the MWP "vanish." Dr. Deming argued Earth's climate is complex, past warmer periods benefited humanity, and policy should not rest on "misinformation and irrational hysteria." He noted 787 scientists from 42 countries contributing to papers affirming the MWP as real, global, and warmer than present—contrasting with UN/IPCC positions.Background
Dr. David Deming, a geologist and geophysicist with degrees from Indiana University and University of Utah, testified about his experiences. In 1995, he published a paper in *Science* on borehole temperature data showing ~1°C warming in North America over 100-150 years. An NPR reporter allegedly conditioned an interview on attributing it to human activity; Deming refused. Shortly after, a "major researcher" emailed him: "We have to get rid of the Medieval Warm Period."
Implications
Dr. Deming's testimony has significant implications for climate science and policy. The alleged attempt to erase the Medieval Warm Period from historical records raises questions about the integrity of climate data and the motivations of researchers. If true, this would suggest that climate scientists are willing to manipulate data to fit a certain narrative, which could undermine public trust in climate science. Furthermore, this controversy highlights the need for transparency and accountability in climate research.Reactions
The viral X (formerly Twitter) exchange has sparked a heated debate among climate scientists, researchers, and policymakers. Many have come out in support of Dr. Deming, calling for greater transparency and accountability in climate research. Others have dismissed his testimony as irrelevant or unsubstantiated. The controversy has also drawn attention from the media, with many outlets covering the story and analyzing its implications.What Happens Next
The controversy surrounding the Medieval Warm Period and Dr. Deming's testimony is unlikely to fade anytime soon. Climate scientists, researchers, and policymakers will need to address the allegations of data manipulation and respond to the concerns raised by Dr. Deming. This may involve increased transparency and accountability in climate research, as well as a reevaluation of the role of the "hockey stick" graph in climate policy.
Frequently Asked Questions
What is the Medieval Warm Period?
The Medieval Warm Period, which occurred from ~1000-1300 AD, is a period of warm weather that brought prosperity, knowledge, and art to Europe. It was well-recognized in literature until contradicted by Mann et al.'s 1999 "hockey stick" reconstruction, which Deming called an artifact that made the MWP "vanish."
Who is Dr. David Deming?
Dr. David Deming is a geologist and geophysicist with degrees from Indiana University and University of Utah. He testified before the U.S. Senate Committee on Environment & Public Works in 2006 about his experiences with alleged data manipulation in climate research.
What is the "hockey stick" graph?
The "hockey stick" graph is a graph of global temperatures over the past 1,000 years, popularized by Michael Mann. It shows a sharp increase in temperatures over the past century, but critics argue that it is an artifact that ignores past warmer periods, such as the Medieval Warm Period.
What are the implications of Dr. Deming's testimony?
Dr. Deming's testimony has significant implications for climate science and policy. The alleged attempt to erase the Medieval Warm Period from historical records raises questions about the integrity of climate data and the motivations of researchers.
What is the current state of the controversy?
The controversy surrounding the Medieval Warm Period and Dr. Deming's testimony is ongoing, with many climate scientists, researchers, and policymakers debating the allegations of data manipulation and responding to the concerns raised by Dr. Deming.