The Death of the Hockey Stick?

People who have been following the climate debate closely know that one of the most controversial and key elements of the controversy is the so-called “hockey stick” — a graph of supposed global temperature over the past centuries that ostensibly shows a dramatic increase in average temperature in the last century or so (the upward swoop of the graph at that point is the business end of the stick, with regard to the puck). It vaulted its inventor, Michael Mann of Penn State University, to climate stardom, with associated acclaim and government grants, when he first presented it in the late ’90s. It was the visual basis of much of the hysteria in recent years, from Al Gore’s Oscar-winning crockumentary to bogus reports from the UN’s Intergovernmental Panel on Climate Change (IPCC).

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Hockey Stick Is Dead

THE HEARTLAND INSTITUTE (via email), 9/30/2009 - One of the most notorious and phony pieces of data underlying global warming alarmism -- the “hockey stick” graph -- has been shattered in a posting today on the World Wide Web. ∴ In 1998, Dr. Michael Mann, then at the University of Virginia, now a Penn State climatologist, published a paper that purported to show that based on tree-ring information, the Earth’s climate was in its hottest period in the past 1,000 years. ∴ The graph is dubbed the “hockey stick” and becomes famous worldwide. Al Gore uses it in his movie An Inconvenient Truth in the famous “elevator scene.” ∴ In the years since then, Steve McIntyre, a Canadian mathematician and climate realist, attempted without success to win access to Mann’s data and to replicate his hockey stick graph. His suspicions grew that Mann’s tree rings didn’t tell a valid story with a giant uptick at the right side of the graph, implicating the twentieth century as the “hottest period in 1,000 years.” ∴Then last year Mann published another paper bolstering his tree ring claim in the Philosophical Transactions of the Royal Society, which has a strict data-archiving policy. Thanks to that policy, McIntyre fought and won access to the data just last week. ∴ Having the tree-ring data in complete form, McIntyre replicates it and plots it, and the infamous hockey stick graph disappears. Not only does it disappear, it goes negative. The conclusion is inescapable: The tree-ring data were hand-picked to get the desired result. ∴ You can read McIntyre’s full report, complete with re-plotted graphs and some outstanding responses, at Watts Up With That? Anthony Watts’ superb site for commentary on puzzling things in life, nature, science, weather, climate change, technology, and recent news. Read More......