Readers may recall this posting A detailed review of Mann’s book: The Hockey Stick and the Climate Wars as it relates to the Wegman report to Congress. This post today is a continuation of that review, with more in-depth technical detail.
By Brandon Shollenberger
The Beginning
Earth Day, April 22, 1998, was the day the hockey stick was born. On that day, Michael Mann, and co-authors Ray Bradley and Malcolm Hughes published a paper in the scientific journal Nature (referred to as MBH98). This paper claimed to reconstruct northern hemispheric temperatures from the past 600 years by examining temperature “proxies” found in nature. The most important of these proxies were tree rings, the size (and density) of which can be influenced by temperatures.
The results of this paper were dramatic. The temperature reconstruction it contained showed relatively flat temperatures for approximately 500 years followed by a sharp increase in temperatures over the last hundred years. The sharp increase formed a curve, which when attached to the end of a relatively flat line created the image of a “hockey stick.” It told the viewer current temperatures were higher than anything seen in hundreds of years. Looking at it, it was almost impossible to think anything other than, “Humans are causing a dramatic change in temperature.”
Not only was the resulting image powerful, it was also extremely definitive. MBH98 claimed modern warmth was unprecedented in 600 years with “roughly a 99.7% level of certainty.” This high degree of confidence was only reinforced by the paper saying it’s conclusions weren’t based on a single type of proxy (such as tree rings), but rather:
the long-term trend in NH is relatively robust to the inclusion of dendroclimatic indicators in the network, suggesting that potential tree growth trend biases are not influential in the multiproxy climate reconstructions.
The authors said their conclusions were almost absolutely certain. They said their results were so certain, you could throw out tree ring data (dendroclimatic indicators), their largest source of data, and they’d still get the same results. The authors were full of it. On page 51 of Michael Mann’s book, he discusses an analysis he performed shortly after MBH98 was published:
The tests revealed that not all of the records were playing an equal role in our reconstructions. Certain proxy data appeared to be of critical importance in establishing the reliability of the reconstruction–in particular, one set of tree ring records spanning the boreal tree line of North America published by dendroclimatologists Gordon Jacoby and Rosanne D’Arrigo.
If “one set of tree ring records” was “of critical importance in establishing the reliability of the reconstruction,” the reconstruction could not have been “relatively robust to the inclusion of dendroclimatic indicators.” While Mann now casually admits the importance of such a small amount of data, neither he nor his co-authors ever made any effort to correct their paper on the point.
The next year, these authors published a new paper (MBH99), extending their hockey stick back another 400 years. In it, they concluded:
The 1990s was the warmest decade [of the last millennium], and 1998 the warmest year, at moderately high levels of confidence.
These two papers, collectively referred to as MBH, formed the basis for what is the most memorable image used in discussions of global warming. In 2000, Bill Clinton referenced it in his State of the Union Address. More importantly, in 2001, the International Panel on Climate Change (IPCC), an organization created by the United Nations to periodically release “assessments” of the state of knowledge on global warming, gave it prominent display. A summary made for government officials of its Third Assessment Report (TAR) even used MBH to conclude it likely “the 1990s has been the warmest decade and 1998 the warmest year of the millennium.” Out of hundreds of pages of documents, this image was selected to be the “public face” of global warming.
Controversy
Controversy began when Stephen McIntyre and Ross McKitrick collaborated on a paper published in the journal Energy & Environment in 2003. They concluded:
The particular “hockey stick” shape… is primarily an artefact of poor data handling, obsolete data and incorrect calculation of principal components.
In response to this conclusion, Mann fabricated a story about McIntyre and McKitrick’s results being based upon a faulty spreadsheet. However, he also said (page 123):
The paper’s dramatically different result from ours… was instead an artifact of the authors’ having inexplicably removed from our network two-thirds of the proxy data we had used for the critical fifteenth-sixteenth century period.46
This is untrue. McIntyre and McKitrick were forced to omit some data (but not two-thirds) because they couldn’t figure out certain undisclosed methodological choices Mann had made. When McIntyre asked Mann to disclose what he had done, Mann refused. Because it was impossible to know what Mann had actually done, McIntyre simply emulated the process as best he could. Despite what Mann claims, the difference in methodology didn’t affect any conclusions.
Peculiarly, the reference Mann gives says nothing about this claim. It says McIntyre and McKitrick were wrong, but gives totally different reasons.
This is especially strange as Mann wrote the article he references.
The Follow-Up
In this book, I attempt to tell the real story behind the hockey stick.
Michael Mann – Prologue
Over the next two years, both “sides” of the controversy tried to support their position. Most notably, Mann was forced to publish a corrigendum by Nature in order to correct errors pointed out in his work, though he claimed, “None of these errors affect our previously published results.”
During this period, Mann and some of his colleagues started a blog, RealClimate. McIntyre started a blog of his own, ClimateAudit, to respond to things posted on RealClimate. Many discussions and arguments were made on these two web sites, eventually leading McIntyre and McKitrick to publish another paper in the journal Geophysical Research Letters (GRL). Mann says of it (page 130):
McIntyre and McKitrick had quietly dropped their erroneous original assertion (in their 2003 paper discussed in chapter 8 that the hockey stick was an artifact of bad data. Their new, albeit equally erroneous, assertion was that the hockey stick was an artifact of the conventions used in applying principal component analysis (PCA) to certain tree ring networks…
While Mann claims the argument by McIntyre and McKitrick was new, it was one they had made in their first paper. The abstract of that paper states (emphasis added):
The particular “hockey stick” shape… is primarily an artefact of poor data handling, obsolete data and incorrect calculation of principal components.
This fact is even acknowledged by Mann in his book (emphasis added – note #45)
To be specific, they claimed that the hockey stick was an artifact of four supposed “categories of errors”: “collation errors,” “unjustified truncation and extrapolation,” “obsolete data,” and “calculation mistakes.”
McIntyre and McKitrick had always been aware there was a problem with how Mann did PC calculations, so this was not a “new” issue. All that was new was McIntyre and McKitrick had realized the data errors they had found were mostly irrelevant to the MBH results. Having realized that, they began to focus more on the main issue, the PC calculations. In regard to this, Mann says (page 137):
McIntyre and McKitrick used a different PCA convention in their 2005 paper. They centered the tree ring data over the long term (1400—1980). That’s fine—in fact, long-term centering is actually the traditional convention…
Clearly, Mann does not think they calculated their PCs incorrectly. Instead, he claims:
Applying our selection rule to these data, using a modern centering convention indicated that the leading two PC series should be retained…. By misapplying a selection rule derived for one convention (modern centering) to PCA results based on a different convention (long-term centering) [they] end up erroneously throwing out the proverbial baby with the bathwater.
Both groups kept two PCs for the North America tree ring network (NOAMER). Mann claims this is wrong, that McIntyre and McKitrick should have kept more. This fairly simple claim is Mann’s basis for dismissing the GRL paper:
In effect, McIntyre and McKitrick had “buried” or “hidden” the hockey stick. They had chosen to throw out a critical pattern in the data as if it were noise
In their GRL paper, McIntyre and McKitrick never said anything about how many PCs to keep. Instead, the paper is a discussion about how PCs were calculated with NOAMER being used as an example. Given Mann’s claim has no possible connection to this paper, it’s natural to try looking at another paper published by McIntyre and McKitrick that year. That paper was published in Energy and Environment (EE), and it did discuss how many PCs get kept:
If a centered PC calculation on the North American network is carried out (as we advocate), then MM-type results occur if the first 2 NOAMER PCs are used in the AD1400 network (the number as used in MBH98), while MBH-type results occur if the NOAMER network is expanded to 5 PCs in the AD1400 segment (as proposed in Mann et al., 2004b, 2004d). Specifically, MBH-type results occur as long as the PC4 is retained, while MM-type results occur in any combination which excludes the PC4. Hence their conclusion about the uniqueness of the late 20th century climate hinges on the inclusion of a low-order PC series that only accounts for 8 percent of the variance of one proxy roster.
Rather than simply “throw out” data based upon a “selection rule,” McIntyre and McKitrick carefully considered what happens based on how much data is used. Mann’s claim is exactly the opposite of the truth in relation to the EE paper (and is completely nonsensical in relation to the GRL paper). He continues this sort of misrepresentation (page 136):
We employed a standard, objective criterion for determining how many PCs should be kept for each region.
In the note he provides, he says the rule he used is called Preisendorfer’s Rule N. There is no evidence this rule was actually used on the tree ring networks. This claim first appeared years after the hockey stick was made, it wasn’t supported by any of the program code released my Mann, and the evidence says it couldn’t have been used.
Mann Seeks Support
During any controversy, people are bound to join in on the arguments. The hockey stick controversy is no different. Mann refers to one example of this when he discusses work by Eugene Wahl and Caspar Ammann (page 138):
Wahl and Ammann demonstrated that the hockey stick was not an artifact of PCA conventions and that the basic result is robust as long as key proxy records are not thrown out (either explicitly as in the original 2003 McIntyre and McKitrick paper, or implicitly through the use of erroneous selection rules, as in their 2005 paper).
Again, Mann repeats his misrepresentations of McIntyre and McKitrick’s work. More importantly, he says Wahl and Ammann find the MBH “result is robust as long as key proxy records are not thrown out.” This is the exact result observed by McIntyre and McKitrick. It is the exact result Mann admits in his book. Everyone agrees if you keep that particular set of tree ring records, you get a hockey stick. If you remove it, you don’t get a hockey stick.
Mann goes on to say Wahl and Ammann:
showed that, had McIntyre and McKitrick subjected their alternative reconstruction to the statistical validation tests stressed in MBH98 and MBH99 (and nearly all related studies), it would have failed these critical tests.
This is problematic in a number of ways. First, McIntyre and McKitrick never claimed to be offering an “alternative reconstruction.” They were merely testing what happened if certain changes were made. This serves the same purpose as running statistical validation tests. Both are ways of seeing how robust a paper’s results are.
Second, Mann raises the issue of statistical validation tests. There are a variety of such tests, the two most important of which are RE and r2. The closer the results of these tests are to one, the better the conclusion is. The problem is McIntyre had long criticized Mann for not publishing r2 verification scores which were practically 0 (very bad). Mann calculated these scores, but he never published the adverse results. When a committee formed by the United States House of Representatives asked Mann:
Did you calculate the R2 statistic for the temperature reconstruction, particularly for the 15th Century proxy record calculations and what were the results?
Mann simply avoided answering the question:
I assume that what is meant by the “R2” statistic is the squared Pearson dot-moment correlation, or r2 (i.e., the square of the simple linear correlation coefficient between two time series) over the 1856-1901 “verification” interval for our reconstruction. My colleagues and I did not rely on this statistic in our assessments of “skill”
He doesn’t admit or deny calculating the scores. He simply says he and his coauthors didn’t “rely” upon them. Whether or not they relied upon the scores, those scores are obviously relevant to anyone looking at the hockey stick. It would especially have been relevant to the IPCC which claimed Mann and co-authors (emphasis added):
estimated the Northern Hemisphere mean temperature back to AD 1400, a reconstruction which had significant skill in independent cross-validation tests.
Even worse, while the adverse results were hidden, Mann and his co-authors published r2 scores when they were helpful. Figure 3 of MBH98 shows r2 scores:
Figure 3 shows the spatial patterns of calibration b, and verification b and the squared correlation statistic r2, demonstrating highly significant reconstructive skill over widespread regions of the reconstructed spatial domain.
Given all this, it is difficult to understand why Mann would bring up statistical validation tests. He has long hidden the fact his own work fails such tests, and there is no reason failing such tests would matter for McIntyre and McKitrick’s results (they weren’t doing an alternative reconstruction).
To add to the oddness, Wahl and Ammann actually show the failing MBH r2 scores.
Congress
A second flood, a simple famine, plagues of locusts everywhere
Or a cataclysmic earthquake, I’d accept with some despair
But, no, you sent us Congress, good God, sir, was that fair?
Piddle, Twiddle and Resolve – 1776 (musical)
By this point, the United States Congress had already gotten involved in the hockey stick debate. In 2006, it increased its involvement by commissioning two reports to study the controversy, the National Academy of Science (NAS) Report and the Wegman Report.
The most important conclusion given by both of these reports deals with a methodological choice made by Mann involving principal component analysis (PCA). Mann used a non-standard implementation of PCA. His critics claimed this caused his method to “mine” for hockey sticks. If true, it would mean Mann’s methodology inherently gave undue influence to that particular shape. Both reports acknowledged this criticism. The NAS Report said:
As part of their statistical methods, Mann et al. used a type of principal component analysis that tends to bias the shape of the reconstructions.
The Wegman Report said:
The net effect of this decentering using the proxy data in MBH98 and MBH99 is to produce a “hockey stick” shape.
Both reports agree the original hockey stick was created by a biased methodology. It sought hockey sticks in the data and gave them undue significance. Despite this, Mann says (page 164):
The more extensive and authoritative NAS review, for example, had specifically dismissed the notion that PCA conventions had any substantial impact on our findings. As Bloomfield had put it at the NAS press conference, “the committee, while finding that the issues are real, [found] they had a minimal effect on the final reconstruction.”
Rather than quote the NAS Report, Mann quotes a comment made in a press conference which isn’t supported by the report. He does quote the report on page 161:
The basic conclusion of Mann et al. (1998, 1999) that the late 20th century warmth in the Northern Hemisphere was unprecedented during at least the last 1,000 years has subsequently been supported by an array of evidence that includes both additional large-scale surface temperature reconstructions and pronounced changes in a variety of local proxy indicators
However, this merely supports the conclusion of MBH, not the methodology. Indeed, nothing in the NAS Report actually supports Mann’s work. Instead, it merely says other work reached the same conclusions. This cannot possibly address the merits of Mann’s work, a point expressed by Edward Wegman (the lead author of the report bearing his name):
Method Wrong + Answer Correct = Bad Science.
Despite this, Mann says:
The NAS report was widely reported to be an affirmation of our work.
Projection
Mann flagrantly misrepresents the NAS report in regards to “bristlecones,” the type of tree the all-important tree ring data was taken from. Mann says of it (emphasis added – page 190):
McIntyre also appealed to the conclusions of the 2006 NAS report to claim that our continued use of the very long bristlecone pine series was inappropriate. Yet this was a misrepresentation of what the NAS had concluded. The NAS panel expressed some concerns about so-called strip-bark tree ring records, which include many of the long-lived bristlecone pines. These trees grow at very high CO2-limited elevations, and there is the possibility that increases in growth over the past two centuries may not be driven entirely by climate, but also by the phenomenon of CO2 fertilization – something that had been called attention to and dealt with in MBH99 (see chapter 4). The NAS report simply recommended efforts to better understand any potential biases by “performing experimental studies on biophysical relationships between temperature and tree-ring parameters”.
This is a gross misrepresentation of the NAS report’s findings. From the very same page as the quote he offers (strip-bark is the type of bristlecones being discussed – page 52):
While “strip-bark” samples should be avoided for temperature reconstructions, attention should also be paid to the confounding effects of anthropogenic nitrogen deposition (Vitousek et al. 1997)…
McIntyre cited a conclusion from the very same page Mann was quoting from, yet Mann claims it was a misrepresentation. Clearly, the reverse is true. More importantly, it is clear bristlecones are a questionable data source. The NAS Report states this. It also acknowledges Mann’s hockey stick was dependent upon bristlecones:
For periods prior to the 16th century, the Mann et al. (1999) reconstruction that uses this particular principal component analysis technique is strongly dependent on data from the Great Basin region in the western United States.
There’s a final oddity to this issue. In a RealClimate post, Mann’s co-author Ray Bradley said:
One final note: bristlecone pines often have an unusual growth form known as “strip bark morphology” in which annual growth layers are restricted to only parts of a tree’s circumference. Some studies have suggested that such trees be avoided for paleoclimatic purposes, a point repeated in a recent National Academy of Sciences report (Surface temperature reconstructions for the last 2,000 years. NRC, 2006).
Mann even commented on that blog post (inline response to comment #7), yet he now completely misrepresents the finding his co-author referred to in it.
His treatment of the Wegman Report is little better (page 164):
The Wegman Report, commissioned by Joe Barton and published several weeks after the NAS report, seemed a transparent effort to further spread the attacks against our work. It uncritically repeated the old and tired McIntyre and McKitrick claim that the hockey stick was an artifact of the conventions used in a statistical (PCA) analysis…
The most important fact about the Wegman Report is not actually found in the Wegman Report. Instead, it was stated by Gerald North, the chair of the panel which wrote the NAS report:
CHAIRMAN BARTON. I understand that. It looks like my time is expired, so I want to ask one more question. Dr. North, do you dispute the conclusions or the methodology of Dr. Wegman’s report?
DR. NORTH. No, we don’t. We don’t disagree with their criticism. In fact, pretty much the same thing is said in our report.
The same point was reiterated by another member of the panel, Peter Bloomfield:
MR. BLOOMFIELD. Thank you. Yes, Peter Bloomfield. Our committee reviewed the methodology used by Dr. Mann and his coworkers and we felt that some of the choices they made were inappropriate. We had much the same misgivings about his work that was documented at much greater length by Dr. Wegman.
Mann claims the Wegman Report was just a repetition of McIntyre and McKitrick’s arguments. The NAS panel agreed with the criticisms found in the Wegman Report…
The Hockey Stick, Redux
“Second verse, same as the first!”
I’m Henery the Eighth, I Am(song)
In 2008, Mann published a new hockey stick. Mann describes it (page 190):
With far more ice core and sediment records now available, we were able to obtain a meaningful reconstruction of the Northern Hemisphere average temperature for the past thirteen hundred years without using tree ring data at all. If tree ring data were used, the reconstruction could be extended, with some reservations, back over the past seventeen hundred years.
Mann’s critics claimed his original hockey stick was purely a product of a small amount of tree ring data. If his new reconstruction was free from that problem, it would be a major development. However, McIntyre almost immediately claimed to find problems with the new reconstruction:
Stephen McIntyre wasted little time in launching a series of attacks on the PNAS paper, employing–it would seem– the strategy of throwing as much mud against the wall as possible and hoping that some would stick. Teaming up with his former coauthor Ross McKitrick, he submitted a short letter to the editor of PNAS claiming that our reconstruction used “upside down proxy data.”52 That was nonsensical, as we pointed out in our response,53 one of our methods didn’t assume any orientation, while the other used an objective procedure for determining it.54
As Mann explains, two different methodologies were used, Composite Plus Scale (CPS) and Error-in-Variables (EIV). However, there is nothing “nonsensical” about saying data was used upside down. The CPS methodology screens proxy records by directly comparing them to the local instrumental records. If the two records are similar enough, the proxy record gets used. The problem is proxy records can increase without meaning temperatures increased. If one were measuring the accumulation of snow/ice, larger values would be expected for cooling, not warming. This increase would be compared to an increase in instrumental temperatures, and thus the CPS methodology would treat the cooling as warming. This would cause the series to be used upside down.
EIV is similar to this, though it doesn’t screen proxy series. Instead, it compares each proxy series to the temperature record and determines how similar the two are. If it finds a similar trend, but in the opposite direction, it “flips” the series upside down. This means both methodologies used by Mann are capable of using proxy series upside down despite the fact he claims such is “nonsensical.”
McIntyre settled then on a more specific avenue of attack: our use of a small group of sediment records from Lake Korttajarvi in central Finland. But this was quite inconsequential and, ironically, we were the ones who had raised concerns about these particular data in the first place, not McIntyre. We had included them for consideration only to be complete in our survey of proxy records in the public domain.
The records Mann is referring to here are commonly called the Tiljander series. The four series are labeled Thickness, Lightsum, Darksum and XRD. Thickness and XRD are measured, but Lightsum and Darksum are derived from those measurements. This means using using all four series, which Mann did, results in double counting.
More importantly, these series were corrupted by human influence. The lake they were taken from began being influenced by farming and construction tn the 1700s. The impact from human influence completely overwhelmed any temperature signal there may have been in the data. The people who originally published the series noted this and cautioned people not to use the modern portion of the series as a temperature proxy.
Since Mann’s methodologies require calibrating proxy series to the instrumental record (1850-1995). it makes no sense to use series whose data has been corrupted in the modern periods. Any correlation which may be found is spurious, not caused by the proxy actually responding to temperature. Since the correlation is spurious, it could not have any connection to the temperature response the series were supposed to have before being corrupted. This is what caused two of the Tiljander series to be used with the opposite correlation as that suggested by the original authors.
Mann’s Nonsense
In the online supplementary information accompanying publication of our PNAS article, we had both noted the potential problems with these records and showed that eliminating them made absolutely no difference to the resulting reconstruction.57 McIntyre had thus attempted to fabricate yet another false controversy
Mann acknowledged the authors warning not to use the data as he did, yet used it anyway. The reasoning he offers for such makes no sense: he says there is “no difference” if he uses the series. If there is no difference, why include them? The answer is simple. Using them makes a huge difference.
The main temperature reconstruction is barely affected by removing the Tiljander series because it includes the tree-ring data which was essential for Mann’s original hockey stick. Mann’s paper claims not to need that data to get a hockey stick, but that is only true if he includes the Tiljander series. If you remove both the Tiljander and tree ring series, there is no longer a hockey stick.
This point is confirmed by Gavin Schmidt, a coauthor of Mann’s at RealClimate:
Since the no-dendro CPS version only validates until 1500 AD (Mann et al (2008) ), it is hardly likely that the no-dendro/no-Tilj CPS version will validate any further back, so criticising how bad the 1000 AD network is using CPS is hardly germane. Note too that while the EIV no-dendro version does validate to 1000 AD, the no-dendro/no-Tilj only works going back to 1500 AD (Mann et al, 2009, SI).
A commenter at RealClimate noticed this remark and asked:
So just to be clear with regard to your response to 525. Under either method (CPS or EIV) it is not possible to get a validated reconstruction to before 1500 without the use of tree rings, or the Tiljander sediments.
Schmidt responded:
That appears to be the case with the Mann et al 2008 network.
Mann himself has acknowledged this. From the Supplementary Information for a later paper:
Additional significance tests that we have performed indicate that the NH land+ocean Had reconstruction with all tree-ring data and 7 potential “problem” proxies removed (see original Supp Info where this reconstruction is shown) yields a reconstruction that passes RE at just below the 95% level (approximately 94% level) back to AD 1300 and the 90% level back to AD 1100 (they pass CE at similar respective levels).
The test used by Mann required his reconstruction pass at a 95% confidence level, and he acknowledges it can only do so by including either the tree ring data or the (nonsensically used) Tiljander series. The “false controversy” he claims McIntyre raised actually repudiates a central claim of Mann’s paper:
With far more ice core and sediment records now available, we were able to obtain a meaningful reconstruction of the Northern Hemisphere average temperature for the past thirteen hundred years without using tree ring data at all.
Nobody Agrees With Mann
Mann continues to spread disinformation (page 198):
When Science in early September 2009 published an article by Darrell Kaufman and his colleagues showing the most dramatic hockey stick yet–a two-thousand-year reconstruction of Arctic temperature changes19–Stephen McIntyre and his forces went on the attack on the Internet,20 immediately trumpeting the false claim that the work was compromised by bad data, despite the fact that whether or not the authors used the data in question made no difference to the result they obtained.
The “data in question” are the Tiljander series which were once again used upside down. Despite Mann’s claims, McIntyre never said this was the source of the Kaufman hockey stick (he primarily blamed another series, Yamal). Beyond that, a few months after the Kaufman paper came out, a corrigendum was published. Included in it was this line:
Record 20 was corrected to reflect the original interpretation of Tiljander et al. (S32) that X-ray density is related inversely to temperature.
Mann claims McIntyre raised a “false claim” to attack a paper, yet the authors of that paper acknowledged his claim was correct. Even stranger, Ray Bradley was a coauthor on both Mann’s 2008 paper and the Kaufman paper. Both papers made the same mistake, but only the Kaufman group admitted it.
A Simple Point
For all the “technical” issues in Mann’s papers, the controversy is actually very simple. Mann’s papers give undue focus to a small amount of data. Even he and his supporters admit his original hockey stick was based entirely upon a small amount of tree ring data (which the NAS says should not be used to measure temperature). His latest hockey stick was the same, save he added upside down data which he couldn’t possibly calibrate to temperature.
Denouement
“If you want a happy ending, that depends, of course, on where you stop your story.”
Orson Welles
One of the most common defenses offered for Mann’s hockey stick is other papers get the same result. The idea is if Mann got the right answer, criticisms of his work don’t matter. This is a dumbfounding position, and the best response is that given above by Wegman:
Method Wrong + Answer Correct = Bad Science.
Mann’s work has been highly publicized. If the glaring problems in it are overlooked, how can anyone trust other papers reaching the same conclusions? What is to stop those other papers from being just as flawed? Nothing. They cannot be ignored or dismissed because of flaws in Mann’s work, but they should all be carefully examined rather than accepted on faith. Unfortunately, the same basic criticisms are leveled against practically every one of those reconstructions.
General Issues
It would be impossible to discuss every paper showing a hockey stick. However, two general problems found in them can be covered. The first problem has already been shown, namely, mistakes don’t get admitted. Mann’s PC1 (the source of his hockey stick) was created with a biased methodology, and it was made up of data the National Academy of Scientists said should be avoided. Despite this, it was included in the latest IPCC report.
Related to the above, papers with hockey sticks tend to rely on the same data. In addition to bristlecones, a commonly used series is called Yamal. Mann discusses it (page 198):
A more vicious attack was reserved for later that month. The matter concerned a tree ring temperature reconstruction for Russia’s Yamal region that Keith Briffa and colleagues had published some years earlier; it once again showed recent warmth to be anomalous in a two-thousand-year context. At a time when Briffa was known to be seriously ill and not in a position to respond to any allegations, McIntyre publicly accused him of having intentionally cherry-picked tree ring records to get a particular result…
To support his “cherry picking” allegation, McIntyre had produced his own composite reconstruction–which happened to lack the prominent recent warming evident in Briffa’s reconstruction.
McIntyre didn’t accuse Briffa of cherry-picking, and he didn’t make “his own… reconstruction.” He simply did a sensitivity test. Testing to see what happens when you make a change is not the same as saying that change is “right.”
How did he accomplish this? By deleting tree ring records of Briffa’s he didn’t seem to like, and replacing them with other tree ring data he had found on the Internet, which were inappropriate for use in a long-term temperature reconstruction
Mann claims the data added was “inappropriate for use in a long-term temperature reconstruction,” but it was no different than the data McIntyre removed. Mann also claims the data was “data he had found on the Internet.” Surprisingly, that’s true. McIntyre found the data on the internet web page for the International Tree Ring Data Bank, the single largest repository for tree ring records… As for the “tree ring records… he didn’t seem to like,” they were 12 cores (tree rings measurements), a rather low amount. McIntyre removed them to see what would happen if a different site’s data was used instead. This new site had 34 cores, a far better number, and it was from the same area. More importantly, McIntyre then added the 12 cores back in and got the same result.
Put simply, McIntyre showed a series with a prominent hockey stick lost it’s hockey stick shape if a little data from the same area was added. This series has been used in a dozen reconstructions. Is it any surprise those reconstructions got the same result as Mann got? All this shows is if you give a small amount of questionable data undue focus, you can get the same results Mann got by giving a small amount of questionable data undue focus.
The hockey stick was originally accepted without anyone verifying it. That was a mistake. Newer hockey sticks were accepted without anyone verifying them. That was a mistake. Will the same mistake be made with Mann’s book?
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> Where has it been demonstrated that if we know the temps for a 2 month period of time that we then know even in a general sense what the annual or decadal temperature mean will be?
I’ve already answered that in general. If you want the details, you’ll have to follow the literature. For example, http://www.meteo.psu.edu/~mann/shared/articles/mbh98.pdf cites http://seaice.apl.washington.edu/Papers/JonesEtal99-SAT150.pdf, from which you should examine figure 1.
> Forget the rings for a moment and say that we have actual thermometers measuring the temps in these locations for the time period of the growing season. You are stating if these temps are known, we can then know the mean temperature for the northern hemisphere on an annual or decadal basis.
No, not quite. I’m stating that the two are related, they are correlated, to some degree. That correlation gets folded into the reconstructions.
> This is easy enough to prove. Please get back with us this summer and let us know how the rest of the year will turn out
You’ve misunderstood; the relationship isn’t directly causal, but probabilistic. If you know the temperature today you can make a reasonable guess at tomorrows temperature (the same as today). But there is no guarantee this guess will be correct.
> But we already know how Wikipedia is supposed to work, and how you work Wikipedia.
No. You think you know, but actually you haven’t got a clue.
> Why must we give your blog a hit at an old post to read self-justifications you can’t be bothered to present here?
I took the trouble to read, and point out the errors in, a laughably inaccurate blog post. I could just copy-n-paste all the text over here, but that would be pointless. If you aren’t brave enough to read text that hasn’t been Officially Sanctioned, or not brave enough to comment in an area where you won’t get backup from the others here, then don’t follow the link.
As readers can see William M. Connolley doesn’t contest that he is a green activist. Not a word of contention disputing it.
William M. Connolley says: March 12, 2012 at 4:43 am
“Sorry guv, you’ve got the wrong strawman. The MWP preceeedes the instrumental record by a fair while.”
“But Sexton, like so many others, treats the MWP and LIA as givens. By some magical means not available to ordinary mortals, he “knows” the hemispheric average temperatures of these periods, and so he “knows” that the reconstructions must be wrong.
Normal scientists don’t have this magical knowledge, so they have to use the observations available instead.”
=============================================================
Yet the IPCC showed it and then they didn’t. By what “magical means not available to ordinary mortals” did MBH arrive at their reconstructions?
And what on earth does any of this have to do with embedded software engineering?
Somebody told me I should respond to Frank o’Dwyer’s supposed “rebuttal” of my work. I’ve already said I don’t think anything of value could come from an exchange with him, and I think people can see through his nonsense on their own. Given that, I see no point in making any lengthy responses. However, I am willing to express my view of the points he raised:
So I go on a hot date, back to0 hers and there on the coffee table is this book, she catches me staring at it and says “It’s such a wonderful book”
Do I just get my coat and walk out?
Reblogged this on Climate Ponderings and commented:
Mann – His own worst enemy?
William M. Connolley says:
March 12, 2012 at 7:16 am
==================================
Thanks William, I hadn’t seen your previous comment prior to me posting my last. Figure one on the Jones paper is a beautiful piece of work which should be labeled, “Fun With Smoothing and Scaling”……. a 10-year Gaussian filter? Ok. This shows that seasons will generally follow an annual trend. I think applying this to the tree ring proxies is a bit of the tail wagging the dog, unless the assertion is the summer temps generally dictate the annual trend.
But, this avoids the question. Can we accurately predict or backcast annual/decadal temps given 2 months of information per year? If this were true, then our forecasting troubles are over! I submit that they are not. BTW, I find figure 6 much more interesting.
From William M. Connolley on March 12, 2012 at 7:16 am:
Very well, I just read the Google cache version.
Your sanctimonious self-righteousness remains unpleasant. Your tactics on Wikipedia are reminiscent of a sleazy TV show lawyer that can’t be prosecuted as they technically follow the laws and regulations yet the slime is evident on all they touch. Your modus operandi remains consistent: You are obviously wrong, I am obviously right, I will point out how wrong you are if I must. As shown in your comments on WUWT, you often stop at the first step.
I will note your own unparalleled act of bravery, as to a James Delingpole post on on December 22, 2009, you waited until January 4, 2010 to courageously drop a link in the comments to your “rebuttal” under the pseudonym “Mr. Stoaty”.
William M. Connolley says:
March 12, 2012 at 4:43 am
Too much brokenness to answer it all, but:>>>
REPLY – avoidance as predicted.
>> Annual temperatures can be (partially) reconstructed from more restricted temperatures, for example from growing season temperatures. This can be empirically verified, by examining the instrumental record
> Which instrumental record? The raw data from the instruments? Or the “adjusted”data? If adjusted, which version?
William M. Connolley says:
You’ve failed to understand. I’ll try again.>>>
REPLY – misdirection as predicted.
William M. Connolley says:
We have an idea: maybe it is possible to retrieve useful information about past temperatures even if you don’t know the entire annual temperature record.>>>
REPLY – midirection. There is no “maybe”. The word you seek is “impossible”.
William M. Connolley says:
Perhaps there is a correlation between parts of the year and the annual value. Its a reasonable idea, but it should be tested. How might we test it? Well, we could just construct synthetic series with roughly the expected statistical properties and try that. Or we could use climate model output. Or we could look at the instrumental record. You could use any version of it you like. Of course you don’t actually need to do any of this yourself – because it has already been done>>>
Reply – obfuscation. It hasn’t been done because is CANNOT be done.
William M. Connolley says:
. Its in those papers that you’re pretending to have read>>>
REPLY – midirection and obfuscation. If it is in those papers, then quote same. Keep in mind when you do that much of what is in those papers that makes these claims is incredibly shoddy work, but go ahead and quote them. You claim the work is there, then produce it.
William M. Connolley says:
> Before the MWP disapeared [sic]?
Sorry guv, you’ve got the wrong strawman. The MWP preceeedes the instrumental record by a fair while
REPLY – while you are correct, you are exploiting a technicality while carefully avoiding the issue that I raise. The instrumental record itself is highly questionable questionable due to lack of accuracy of the weather stations themselves, controversial adjustments to data, and lack of accounting for UHI and land use effects. Given that the instrumental record itself is questionable, it cannot be cited as proof of anything that correlates to it. Worse, since 1960, tree rings in particular have NOT correlated to it. Which is right? The tree rings? Or the intruments? Has it crossed your mind that the answer might be that they are both wrong?
> After you get done answering that, could you advise as to how the tree ring data, which represents growing season only, is adjusted to account for variations in precipitation?
William M. Connolley says:
Again, its in the papers you’re pretending to have read. If WUWT was indeed the useful scientific resource you think it is, there would be a post here explaining this point, since it seems to confuse some.
REPLY – Again, quote your source. you want a post here explaining this point? SO POST IT! You insist is should be on WUWT, what exactly is preventing you from putting it up?
I not also that you snipped the other issues I raised. Yes there is a discussion in SOME papers about precipitation, and in fact SOME papers show that temperature is anti-correlated with temperature and more strongly correlated with precipitation. But what of the other issues I raised? Are you going to claim those are in the papers as you claim as well?
Seems to me that you have not answered a single question directly, not one. You’ve waved your arms with replies like “its in the papers you claim to have read” while complaining that the material from those papers isn’t highlighted on WUWT, but you don’t lift a finger to post the material itself.
Why?
Because you cannot. Those papers take nothing into account regarding disease, pestilence, late frosts, variability in pollination, changing migration patterns of birds and other animals that can have both positive (fertilizer, elimination of pests) and negative (foraging) effects on the growth of the trees.
I became a skeptic in part because I in fact DID read those papers, and many others too, and they are riddled with holes such as the ones I just identified.
If you want to retain a shred of credibility, then respons directly to my questions, point out the specific studies you speak of, and quote from them directly.
You won’t because you can’t
Pat Frank says:
March 11, 2012 at 8:23 pm
Gail, your prescription would toss me out as well, and all my DOE funded colleagues at SLAC, where everyone I know pays enormous attention to exquisite detail, achieves technological miracles under budget, and does honest, verifiable, science; cutting-edge experimental today, providing tax revenues in 20 years.
Do you really want to wreck the huge majority honest to get at the minority corrupt, or is some rational discrimination preferable?
______________________________________
I want to go through the answer to that point by point: (Sorry it is so long)
1. The CAGW Luddites want to send us back to a technological age similar to colonial times. The universities that get grant money are supporting that position and so is John Holdren, who is Director of the White House Office of Science and Technology Policy, Assistant to the President for Science and Technology, and Co-Chair of the President’s Council of Advisors on Science and Technology. He advocated “De-Development’ of the United States” in the textbook he co-authored with Paul R. Ehrlich and Anne H. Ehrlich. That book is used in universities to teach the following crap for forty years and thereby influencing generations of students. It is still in print. http://www.amazon.com/Human-Ecology-Paul-Holdren-Ehrlich/dp/B001K571OM
“De-development means bringing our economic system (especially patterns of consumption) into line with the realities of ecology and the global resource situation….The need for de-development presents our economists with a major challenge,….They must design a stable, low-consumption economy in which there is a much more equitable distribution of wealth than in the present one. Redistribution of wealth both within and among nations is absolutely essential, if a decent life is to be provided to every human being.” Human Ecology 1973
More on Holdern here: http://zombietime.com/john_holdren/
2. The Government of the USA is spending money like water. Some say the USA is already bankrupt.
“To those who study the numbers, it is now obvious that America’s fiscal situation is hopeless. … it will be statistically impossible for the United States to pay its obligations … Inferential analysis is now saying that a game-changing trend ….. Stewart Dougherty is a specialist in inferential analysis….” http://www.kitco.com/ind/Dougherty/aug262009.html
“The U.S. is bankrupt. Neither spending more nor taxing less will help the country pay its bills…”The IMF is saying that closing the U.S. fiscal gap, from the revenue side, requires… an immediate and permanent doubling of our personal-income, corporate and federal taxes as well as [the Social Security and Medicare payroll taxes]…” http://www.philly.com/philly/blogs/inq-phillydeals/Is_US_already_bankrupt_.html
Yet another article says “The recession killed off 7.9 million jobs. It’s increasingly likely that many will never come back.” http://money.cnn.com/2010/07/02/news/economy/jobs_gone_forever/index.htm?postversion=2010070223&iid=EAL
In other words the US government does not HAVE the money to give away as grants they have to BORROW IT. Continuing to borrow is insane because the US dollar has already lost its “glamour” and if it is replaced by another as the “World Reserve Currency” The USA is looking at Hyperinflation when the USD loses its “World Reserve Currency” status. Pascal Lamy, head of the WTO is already advocating …“reform of the international currency system” http://theglobaljournal.net/article/view/256/
China and Russia have already deserted the US dollar: http://www.ibtimes.com/articles/85424/20101124/china-russia-drop-dollar.htm
Hyperinflation analysis: http://www.creditwritedowns.com/2011/04/on-hyperinflation.html
3. Have you ever even looked at the grants given by the USA??? I have. http://grant-opportunities.idilogic.aidpage.com/
We give grants like Democracy, Human Rights, and the Rule of Law in the People’s Republic of China, $15,000,000 total funding….. HUH??? The USA is borrowing money from China so they can give grants TO China??? This is only one of a large number of foreign money give aways.
Also we have the U.S. WWF gets 20% of its revenue from government tax money… $24,589,994 in 2001. http://www.undueinfluence.com/wwf.htm
4. “Americans are more apt to donate to a charity, volunteer, or help a stranger than residents of 152 other countries.” http://www.csmonitor.com/World/Making-a-difference/Change-Agent/2011/1221/Americans-are-the-most-generous-global-poll-finds
In other words if taxes did not wipe out over 60% of my income I would have more money to give to my alumni association earmarked for the research I Want instead of a grant some politician makes as a payback for getting elected. With money comes power and I want that power in my hands not in the hands of a slimy politician.
For example
Crony Capitalism: $737 Million Green Jobs Loan Given to Nancy Pelosi’s Brother-In-Law
“Despite the growing Solyndra scandal, yesterday the Department of Energy approved $1 billion in new loans to green energy companies — including a $737 million loan guarantee to a company known as SolarReserve…. “Ronald Pelosi, a San Francisco political insider and financial industry polymath who happens to be the brother-in-law of Nancy Pelosi…”
http://www.weeklystandard.com/blogs/crony-capitalism-737-million-green-jobs-loan-given-nancy-pelosis-brother-law_594593.html
5. Then there is the inefficiency of moving wealth via government.
“….One-third of all their taxes is consumed by waste and inefficiency in the Federal Government as we identified in our survey….” Grace Commision Report: http://www.uhuh.com/taxstuff/gracecom.htm
Finally in the words of Dwight D. Eisenhower
” In the councils of government, we must guard against the acquisition of unwarranted influence, whether sought or unsought, by the military-industrial complex. The potential for the disastrous rise of misplaced power exists and will persist.”
Grants and government “loans” are a method for “acquiring unwarranted influence” by politicians and that is one reason why I am against them.
On top of that a nearly bankrupt country of Shop Keepers and Burger Flippers can simply no longer afford to develop technology that is then given to other countries and not retained for our economic advantage.
U.S. Commercial Technology Transfers to the People’s Republic of China: http://www.bis.doc.gov/defenseindustrialbaseprograms/osies/defmarketresearchrpts/techtransfer2prc.html
A note on my comment of a country of Shop Keepers and Burger Flippers
“…Today the US has a consumer-based economy where nearly everything is manufactured overseas and sold back to us in our stores. With manufacturing gone, citizens within the US still need to work somewhere…. Our largest domestic employers are retailers; not manufacturers…. If we look at the top fifteen most common jobs in the US, ….The sum total of people working in these types of jobs amounts to around 30.5 Million Americans, or about 15% of the working age population. While that percentage may not sound like much, we must remember that these are only our most common jobs found in the US. This list does not include most middle class jobs, such as sales reps, area managers, marketing specialists, or others directly employed by retail, distribution, or restaurant companies in corporate or regional offices….. Many of the remainder of the workforce fulfill job duties that are essential services needed by any nation, regardless of the type of economy…..” http://oldempresario.hubpages.com/hub/The-Land-of-Shopkeepers-and-Armourers
So yes, I was completely serious.
> Very well, I just read the Google cache version.
That will do just as well. I notice that you’ve failed to find any errors in it, and have no objections to the numerous errors I point out in the WUWT post. If you can find any errors in it, do be sure to post them here, or indeed there, if you’re brave enough.
Brandon Shollenberger,
Thank you for writing that, and for responding to the posts criticizing your work. To the criticism that it has all been written and ignored before, let me counter that the truth needs to be repeated over and over so that it can not be ignored and forgotten. Mann’s book has been praised as putting the worst controversies over his work to rest, so someone like you is required to review the book in detail and show that Mann continues to obfuscate, and to show that his writing can not be trusted. Mann and his supporters are counting on his book being read but not being double-checked, so it is extremely valuable that you have read it and have double-checked and have written what you have found.
Thank you again.
Septic Matthew/Matthew R Marler:
I’m glad to! I’ve actually tried for years to get any sort of real discussion with people who disagree with me, so I’m hoping this might lead to that. Even if it doesn’t, at least I’ll know my time hasn’t been completely wasted like sometimes it feels.
Speaking of which, Arthur Smith recently posted a comment on my review on Amazon. He refers to a blog post by DeepClimate, but he misrepresents what it says (while claiming I seem unaware of it, no less). This is the same Arthur Smith who a year and a half ago refused to acknowledge Mann had calculated R2 scores then failed to publish the adverse results even though the evidence was indisputable. This is the same Arthur Smith who, the next year, claimed nobody would give him evidence of this sort of behavior.
Sorry for going off-topic, but that sort of behavior is dumbfounding to me. How can you have a discussion with people who make things up about sources they provide, refuse to look at the sources you provide, and simply deny that you ever provided them? I know there must be reasonable people who defend Mann’s work, and I want to talk to them. Where are they?
What do you do when the most reasonable response you get is like Frank o’Dwyer’s?
Brandon,
Once again (but in a separate venue) thank you.
One thing I would like to see clearly stated, in order to preserve the history, is Mann’s use of the internet to abuse his detractors.
The way I recall the sequence of events:
1. MBH98 was published
2. M&M was published
3. Real Climate was created to defend MBH98 etc. (under the guise of climate science)
4. M&M attempted to respond at Real Climate but were heavily moderated
5. Steve McIntyre created Climate Audit to voice his defense of the prosecution at Real Climate
If Mann is presenting anything other than this his is wrong.
Jeff Norman, you’re welcome!
I want to offer a few thoughts on your chronology. Primarily, you say “MBH98 was published,” but you leave off the part about MBH99 being published. You could easily remedy this by just saying “MBH was published.” The only time you need to list numbers after MBH is if you’re referring to the papers individually.
As for McIntyre’s blog, he actually started by creating a web site. It was only later he created the blog. That mainly matters to me because I actually stumbled across that original web site before the blog existed, and it’s what made me start following the hockey stick debate. I guess you could say I don’t want to forget my roots.
Brandon Shollenberger;
What do you do when the most reasonable response you get is like Frank o’Dwyer’s?>>>>
One must understand the mind set of the person with whom you are having the disussion:
1. There are those who have deliberately lied. No amount of evidence will make them abandon their lie.
2. There are those who believe the lies because they fit with their world outlook. Only a massive amount of evidence will make them abandon their belief because they must abandon not only the lie, but their belief system.
3. There are those who are mistaken, and know so. They will abandon the lie only when it is to their personal benefit to do so.
4. There are those that have accepted the lies for no other reason than that they are pervasive…the “concensus”.
Explain, debate, argue with them all. Not because you are likely to change a single mind in the first three categories, but because the people in those three categories are who we must debate with in the hopes that those in the 4th category read one or two paragraphs and actually begin to think things through for themselves based on the facts.
davidmhoffer:
I share the same viewpoint as you. My problem is I don’t understand why the people in the fourth category never speak up. I think I would die of shock if I ever had anyone respond to me by saying something like, “I don’t think you’re right because I’ve heard X, Y and Z. Is there some counterarguments I’m not aware of?”
The crazy part is I’ve gotten responses like that in discussions of basically everything else. That includes religion and politics. Think about that. I have an easier time finding reasonable disagreements over religion and politics than I do the hockey stick controversy.
Connolley,
Do you tell your children to be honest?
Brandon – you seem to have attracted the attention of the rabid nutters – Rob Honeycutt, Arthur Smith and co, who have been making a point of spamming their irrelevant comments and eulogies all over the hostile reviews to the Holy Book of Mann. I am just surprised that the mighty Scott Mandia hasn’t jumped in with his praise of Mann for shouldering mthe burden of saving the world. But kudos for attracting the greatest compliment of all, from someone called Rob Honeycutt – a classic of the irrelevant justification meme:
<b. In reply to an earlier post on Mar 12, 2012 4:13:50 PM PDT
Rob Honeycutt says:
Brandon… Yes, Wegman is a statistician. But the whole upshot of the entire report was that NONE of it changed the conclusions of Mann's work. The whole complaint of Wegman and others ends up being that he got the right result using the wrong means.
Brandon Shollenberger says:
March 12, 2012 at 12:45 pm
Septic Matthew/Matthew R Marler:
Thank you for writing that, and for responding to the posts criticizing your work.
I’m glad to! I’ve actually tried for years to get any sort of real discussion with people who disagree with me, so I’m hoping this might lead to that. Even if it doesn’t, at least I’ll know my time hasn’t been completely wasted like sometimes it feels.
=================================================
🙂 Brandon, we all get to feeling that way. The way I see it, if one engages and you’ve provoked thought, then the day is won. Even when arguing with people who will never openly cede any ground or point, a seed is planted. Further, there are many who read and don’t comment. They’ve read your challenges and your responses. You’ve also caused many to engage and you’ve provoked thought. Well done. And thanks!
@ur momisugly William Connolley, I’d like to thank you as well. An echo chamber is a dreadful thing. You and just a few others choose to engage here. While I make it a point to load Mann’s works every time I change PCs, I failed to do so with Jones’. My memory isn’t what it was, apparently. I didn’t recall that particular perspective. While I disagree with the way it is presented, it has set me to some work to at least show why I believe it is improper. Though it will be tedious, I’ll not be worse for it. Thanks.
Brandon Shollenberger says: @ur momisugly March 12, 2012 at 12:45 pm
……Sorry for going off-topic, but that sort of behavior is dumbfounding to me. How can you have a discussion with people who make things up about sources they provide, refuse to look at the sources you provide, and simply deny that you ever provided them? I know there must be reasonable people who defend Mann’s work, and I want to talk to them. Where are they?…..
________________________________________
They wised up and deserted the “Cause” in droves.
All that are left are the hypocrites who have a vested interest in continuing the lie because their jobs depend on it, the uneducated who do not have the scientific or logic training needed to see the lie and the fanatics to whom lying for the “Cause” is justified.
diogenes says:
“…Wegman is a statistician. But the whole upshot of the entire report was that NONE of it changed the conclusions of Mann’s work. The whole complaint of Wegman and others ends up being that he got the right result using the wrong means.”
That’s absurd. Mann’s conclusions have been falsified. He got the wrong result using the wrong means.
And Mann continues in character: he deliberately used a corrupted proxy in Mann08 that he had been informed was corrupted before he published. Explain how that is acceptable science.
The guy is a scientific charlatan. If you want to read a book that is — by comparison — completely unbiased, read A.W. Montford’s The Hockey Stick Illusion. Only credulous, unquestioning, mouth breathing followers who believe everything Mann says in his own book would take it at face value.
Mann is a shameless self-promoter of catastrophic AGW pseudo-science, expecting the public to believe in his teleconnected treemometers. As if. Mann wouldn’t be afraid to debate it publicly with scientific skeptics if he truly believed what he’s trying to sell. But Mann is very afraid to debate, and he hides out in his ivory tower rather than allow his CAGW story to be ripped to shreds, like it is here on a daily basis on the internet’s Best Science site.
They wised up and deserted the “Cause” in droves….
I should have added these polls.
Gallup Poll:
“March 11, 2010
Americans’ Global Warming Concerns Continue to Drop….public that over the last two years has become less worried about the threat of global warming, less convinced that its effects are already happening, and more likely to believe that scientists themselves are uncertain about its occurrence. In response to one key question, 48% of Americans now believe that the seriousness of global warming is generally exaggerated…” http://www.gallup.com/poll/126560/americans-global-warming-concerns-continue-drop.aspx
Rasmussen Reports
69% Say It’s Likely Scientists Have Falsified Global Warming Research Wednesday, August 03, 2011 http://www.rasmussenreports.com/public_content/politics/current_events/environment_energy/69_say_it_s_likely_scientists_have_falsified_global_warming_research
Unfortunately the mild winter and continued Propaganda has taken its toll.
Rasmussen Reports
Saturday, January 07, 2012
“….Belief that global warming is a serious problem is at its highest level in two-and-half-years… telephone survey of Likely Voters finds that 64% say global warming is at least a somewhat serious problem, including 30% who say it’s Very Serious. One-in-three voters (33%) believe climate change is not a serious problem….” http://www.rasmussenreports.com/public_content/politics/current_events/environment_energy/energy_update
The chart in the article showing the Date of the Poll vs “Global Warming is Primarily Caused By…..” That is Human activity, Planetary Trends or other is interesting.
Brandon,
You are dealing with environmental religion cult members.
They have their orginized system of now to know things.
diogenes:
When I’m feeling cynical, I view these people as launderers. Michael Mann and others won’t make the arguments themselves,* but they seem happy to allow others to make arguments for them. They’ll even go so far as to praise those arguments, such as Michael Mann has with Frank o’Dwyer’s “rebuttal.” It’s effectively a way of getting wrong arguments out there to misinform people while maintaining plausible deniability.
Or at least, that’s how I wind up feeling.
James Sexton:
You’re welcome! I’m just happy to know I have provoked thought in some people.
I always wonder just how many of these people there are. For anything I say, it could be ten people who read it, or ten thousand. It’s a little disconcerting at times.
*There are arguably some exceptions to this, such as with the Gavin’s Guru saga.