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Topic: Hockey stick graph

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Michael Mann (scientist)

Hockey stick

Ice hockey

Northern Hemisphere

	Hockey stick - Wikipedia, the free encyclopedia
		In climatology, the "Hockey Stick graph" is a nickname for a rising temperature reconstruction.
		A hockey stick is the equipment used to handle a man/woman in ice hockey, field hockey or roller hockey.
		In business a "hockey stick graph" [9] is an absurdly optimistic projection of business growth which is flat for a long time like the handle of a hockey stick and then suddently turns upward like the blade of a hockey stick.
	en.wikipedia.org /wiki/Hockey_stick (936 words)

	The Heat Is Online
		One of the pillars of the case for man-made global warming is a graph nicknamed the hockey stick.
		The hockey stick was a highlight of a 2001 report by the U.N.'s Intergovernmental Panel on Climate Change.
		From the outset, the graph was a target of numerous lobbyists and skeptics.
	www.heatisonline.org /contentserver/objecthandlers/index.cfm?id=5108&method=full (1942 words)

	TCS Daily - Hockey Stick Shortened?
		The IPCC's use of the hockey stick was not incidental: it is prominent throughout the 2001 report.
		The hockey stick, in short, is 600 years shorter than it was before and the uncertainties for previous centuries are larger than Mann gave credence.
		With the "hockey stick" now shortened, what is needed is for another McKitrick and McIntyre to inspect the climate models, which form the basis for most of the scary scenarios of future global warming.
	www.tcsdaily.com /article.aspx?id=062706E (1203 words)

	Temperature Study Gives Credence To Global Warming (Site not responding. Last check: 2007-10-23)
		The panel dismissed critics' charges that fraud and error are responsible for the graph's sharp upward swing, noting that many studies had confirmed its essential conclusions in the eight years since it first was published in the journal Nature.
		The finding was a rebuke to global warming skeptics and some conservative politicians who repeatedly have attacked the hockey stick as the work of overzealous scientists determined to shame the government into imposing environmental regulations on big business.
		The graph shows a stretch of stable temperature lasting for 900 years that suddenly arcs upward in the past century, resembling a hockey stick laid on its side.
	www.tbo.com /news/nationworld/MGBZ81VZROE.html (819 words)

	RealClimate » Myth vs. Fact Regarding the "Hockey Stick"
		MYTH #3: The "Hockey Stick" studies claim that the 20th century on the whole is the warmest period of the past 1000 years.
		MYTH #4: Errors in the "Hockey Stick" undermine the conclusion that late 20th century hemispheric warmth is anomalous.
		The first falsehood holds that the "Hockey Stick" is the result of one analysis or the analysis of one group of researchers (i.e., that of Mann et al, 1998 and Mann et al, 1999).
	www.realclimate.org /index.php?p=11 (3441 words)

	Competitive Enterprise Institute
		This proposition is most dramatically expressed in the "hockey stick" graph contained in the Intergovernmental Panel on Climate Change's third assessment report.
		The graph shows temperatures mostly flat for the last 1,000 years, before a sudden, sharp rise in the 20th century that, on a graph, looks like the blade of a hockey stick.
		The graph is very persuasive — it caused Sen. John McCain (R., Ariz.) to express alarm when he first saw it in May 2000, and played a part in McCain's bringing to the Senate floor the misguided and economically destructive Climate Stewardship Act, which was defeated last week.
	www.cei.org /gencon/019,03734.cfm (695 words)

	Temperature record of the past 1000 years - Wikipedia, the free encyclopedia
		The Mann, Bradley and Hughes (1998) version of the temperature record has an unofficial name, the "Hockey Stick" graph, first coined by Jerry Mahlman, a colleague of Mann's.
		In 2006, a National Academy of Sciences panel concluded that data was too sparse to fully support the decadal and single year conclusions.
		Steve McIntyre has recently been quoted as saying "I'm inclined to agree that, for the most part, the Hockey Stick does not matter to the great issue of the impact of 2xCO2." and this is a point of agreement on both sides.
	en.wikipedia.org /wiki/Temperature_record_of_the_past_1000_years (2120 words)

	Le Moyne College Office of Communications (Site not responding. Last check: 2007-10-23)
		The “hockey stick” temperature chart originates from two seminal research papers published in Nature in 1998 and Geophysical Research Letters in 1999 by Mann, along with Ray Bradley of the University of Massachusetts at Amherst and Malcolm Hughes of the University of Arizona.
		The chart is relatively flat from the period AD 1000 to 1900, indicating that temperatures were relatively stable for this period of time.
		But after 1900, temperatures appear to shoot up (forming the hockey stick’s blade), which led the researchers to conclude that man-made “greenhouse gas” emissions are the major cause of the global warming phenomenon.
	www.lemoyne.edu /communications/Comm_Press.asp?id=225 (366 words)

	Climate Audit » The Significance of the Hockey Stick (Site not responding. Last check: 2007-10-23)
		Recently, as the hockey stick looks more and more splintered, some climate scientists have argued that the hockey stick graph was merely incidental in Kyoto promotion.
		This thread is headed “The Significance of the Hockey Stick”, and the main “article” is about the presumed “promotion” of the hockeystick by the IPCC and others.
		The fact that the hockey stick is merely an artefact of bad statistical practices, and the Vostok ice core records, although I would make no criticism of the science, are being used outside their limitations, appears to be of no concern to the IPCC.
	www.climateaudit.org /index.php?p=138 (4047 words)

	SitNews - Chemical Eye on Hockey Sticks and Global Warming by Preston MacDougall
		The "hockey stick" in the title is the nickname of a graph of thousands of Northern hemisphere temperature data points over the past 1,000 years.
		The "hockey stick" graph that is currently at the center of the global warming face-off.
		In hockey lingo, that would be five-minute majors to both teams for fighting, and a two-minute minor to the Kyoto team for using a stick with an illegal curve.
	www.sitnews.us /MacDougall/030305_macdougall.html (789 words)

	Past, Present, and Future Temperatures: the Hockeystick FAQ
		The graph got its name because its shape resembles a hockey stick, with the blade end representing the sharp temperature rise over recent years.
		As is typical of the scientific process, independent teams of researchers have worked to reproduce the results of the "hockey stick" by using their own approaches and even by using slightly different data.
		The short answer is "very little." The hockey stick graph constitutes only one among literally thousands of pieces of evidence that have contributed to the present scientific consensus on the human influence on global warming.
	www.ucsusa.org /global_warming/science/hockeystickFAQ.html (1513 words)

	REVISITING THE ‘STICK’ (Site not responding. Last check: 2007-10-23)
		However, the specialists who studied bristlecones had explicitly stated that their hockey stick shape is not a temperature signal but is likely due to aerial carbon dioxide fertilization.
		The hockey stick program loads maximum weight on these bristlecone records: if they are removed from the data, the hockey stick shape disappears.
		We also showed that the hockey stick authors (Mann, Bradley and Hughes) had withheld vital data (certain verification statistics), which showed their conclusions were statistically insignificant, and that their interpretation of the one verification statistic they did report was incorrect.
	www.bensimonton.com /RevisitingtheStick.htm (1404 words)

	Climate-Gate: The Bush Administration, Global Warming and the EPA's Report on the Environment - a View from the Senate
		The hockey stick graph represents scientific consensus and is the best science on the subject of global warming.
		The hockey stick was developed by Dr. Michael Mann, of the University of Virginia, and others.
		Despite reporting that says the hockey stick represents "consensus," it is in fact widely disputed within the scientific community.
	www.nationalcenter.org /Climate-Gate.html (956 words)

	World's First Global Thermometer (Site not responding. Last check: 2007-10-23)
		The controversy only heightened with the advent of the so-called “hockey stick” graph that purports to show a dramatic rise in global temperature during the 20th century.
		The infamous hockey stick graph tries to dramatize the alleged increase in temperature by going back 1,000 years.
		In this light, the hockey stick’s GMTs over the last 1,000 years are near worthless — yet it is this very data that are being used to drive global warming hysteria.
	www.canadafreepress.com /2005/milloy052105.htm (871 words)

	TCS: Tech Central Station - It's an ex-Hockey Stick!
		It is a rather simple looking graph -- with a long, stable shaft and a fast rising blade -- that purports to represent averaged Northern Hemisphere temperatures over the last thousand years.
		But the latest strike against the hockey stick is the most devasting yet, shattering it into a million billion pieces.
		Hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick hockey stick.
	timlambert.org /parody/tcs (480 words)

	The Committee on Energy and Commerce (Site not responding. Last check: 2007-10-23)
		Mann, or his "hockey stick" graph of global temperature changes, is right.
		Mann himself -- and his hockey stick -- is at the center of that network.
		And the dismissive reaction of the climate-research establishment to the McIntyre-McKitrick critique of the hockey stick confirms that impression.
	energycommerce.house.gov /108/News/07142006_1990.htm (728 words)

	Tree Ring Circus
		The hockey stick graph has been key weapon in the arsenal of the global warming alarmists in their efforts to scare the U.S. into signing the Kyoto Protocol and clamping down on greenhouse gas emissions and energy use.
		Not only is temperature merely one factor that contributes to tree growth (as evidenced by the ring size), but a 15th century portion of the hockey stick graph is based on tree ring measurements from a single tree.
		Noting that “sharing data and research results is a basic tenet of open scientific inquiry” and that the hockey stick research was paid for with public funds, Chairman Barton asked Dr. Michael Mann of the University of Virginia for the computer code used to generate the hockey stick graph.
	www.canadafreepress.com /2005/milloy080905.htm (931 words)

	Welcome to Climate2003
		The original hockey stick study was published by Michael Mann of the University of Virginia and his coauthors Raymond Bradley and Malcolm Hughes.
		The error causes their PC method to nearly always identify hockey stick shaped series as the “dominant pattern” in a data set (the so-called “first Principal Component” or PC1), even when the data are just random numbers.
		Regardless of the role of the data mining method, it is important to recognize and fully assess the role of these series in imprinting a hockey stick shape and to completely assess whether they are the correct way of measuring world climate history.
	www.climate2003.com (1706 words)

	Alfred University : News
		Their findings revealed that temperature patterns placed on a graph resembled a hockey stick — the period from 1,000 AD to approximately 1900 showing a slow decrease with relatively little variability (resembling the shaft of a hockey stick), while temperatures began a steady climb around 1900 (resembling the blade of the stick).
		Their study, which was presented again with modifications earlier this year, contends that global temperatures during the early 1400s are similar to those in the late 20th century, thus claiming the hockey stick-shaped graph is inaccurate and elevating the magnitude of natural climate variations.
		“The blade (in the hockey stick graph) shows that something happened in the 20th century to cause this unusual increase” in global temperatures, Wahl said.
	www.alfred.edu /pressreleases/viewrelease.cfm?ID=2775 (751 words)

	Coalblog » Blog Archive » UN IPCC “Hockey Stick” graph is flawed and unreliable (Site not responding. Last check: 2007-10-23)
		The icon is The Hockey Stick, a nifty graphic that claimed to show that the world climate drifted along at a nice, stable temperature for almost 1,000 years until the late 20th century, when temperatures suddenly started to soar.
		News that The Hockey Stick, reproduced and cited in thousands of reports and publications, is about to get zapped is sweeping the climate science community.
		The department’s sole evidence for this is The Hockey Stick.
	www.coal.ca /blog/?p=22 (602 words)

	Editorial: Scientists documenting global warming score with their hockey stick graph (Site not responding. Last check: 2007-10-23)
		Perhaps the most iconic image of global climate change is what researchers refer to as the hockey stick, a graph charting temperatures in the Northern Hemisphere in the past 1,000 years that shows a sharp increase, angled like the blade of a hockey stick, starting in the 1990s.
		The graph's key message is that the 20th century was the warmest of the past millennium, and that the 1990s were the warmest years of that warm century.
		The NAS endorsement of the hockey stick delivered a sharp blow to the anti-global-warming crowd.
	www.statesman.com /opinion/content/editorial/stories/07/1editorial4_edit.html?cxtype=rss&cxsvc=7&cxcat=45 (599 words)

	[No title] (Site not responding. Last check: 2007-10-23)
		The graph purports to chart global temperatures over the past millennium; a sharp rise at the current end is the 'blade' that makes the otherwise flattish line look like a hockey stick.
		The researchers concluded in their 1999 paper that "the 1990s are likely the warmest decade, and 1998 the warmest year, in at least a millennium", and included a graph showing a sharp upturn in temperature from about 1900 onwards.
		The plot soon became known as the hockey stick, and was featured prominently in the executive summary for policy-makers in the 2001 report on global warming from the Intergovernmental Panel on Climate Change (IPCC).
	www.nature.com /news/2006/060626/full/4411032a.html (982 words)

	The Heartland Institute - Nature Admits Widely Cited Global Warming Graph Was Erroneous - by Iain Murray and ...
		The 1998 article was the initial source for the "hockey stick" graph cited by the United Nations Intergovernmental Panel on Climate Change (IPCC) and others in predicting imminent and significant global climate change.
		The hockey stick graph purported to show the global mean temperature was relatively constant through the first nine hundred years of the past millennium and then rose sharply in the twentieth century.
		That graph accordingly takes the shape of a hockey stick lying on the ground with its blade poking up in the air.
	www.heartland.org /Article.cfm?artId=15557 (654 words)

	Capital News Online \| News \| More hot air about Kyoto
		An environmental study released in 1998 included a "hockey stick" graph that showed the 1990s were the hottest decade on record.
		However, a study published in February 2005 in Geophysical Research Letters contested the claim of the "hockey stick." Authors Ross McKitrick and Stephen McIntyre analyzed the methodology of the study, which was led by University of Virginia environmental science professor Michael Mann.
		They recreated the graph using the computer program that simulated the original "hockey stick." Several hockey sticks were recreated, even when numbers not relating to temperatures were input.
	temagami.carleton.ca /jmc/cnews/04032005/n3.shtml (827 words)

	2005 Environmental Index: Climate Change p18
		Dispute continues over Michael Mann’s “hockey stick” graph, which purports to prove that the last 25 years have been the warmest in the last 1,000 years.
		The dispute about Michael Mann’s “hockey stick” graph, which purports to prove that the last 25 years have been the warmest in the last 1,000 years, has intensified in recent months.
		As reported in last year’s edition, the Mann “hockey stick” graph would seem to negate what has always been referred to as the “medieval warm period” that preceded the “little ice age,” from roughly 1400 to 1850.
	www.pacificresearch.org /pub/sab/enviro/05_enviroindex/18_climate_change.html (1746 words)

	16/3/2005 -- New row on climate 'hockey stick'
		The hockey stick graph originally appeared in a research paper publshed in Nature in 1998 by US scientists Michael Mann, Raymond Bradley and Malcolm Hughes.
		The simple and dramatic way the graph illustrates recent global warming - not to mention its inclusion in a key report by the United Nations' Intergovernmental Panel on Climate Change (IPCC) - has made the hockey stick a talisman of sorts for those advocating action to curb the release of greenhouse gases.
		He points to a paper published in February in Nature by Anders Moberg and colleagues that found the late 20th Century was the warmest period in at least the past 2,000 years, using data from climate proxies such as lake sediments and stalagmites.
	www.climateark.org /articles/reader.asp?linkid=40076 (835 words)

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