By Declan McCullagh, CBS On-line

A few days after leaked e-mail messages appeared on the Internet, the U.S. Congress may probe whether prominent scientists who are advocates of global warming theories misrepresented the truth about climate change.

Sen. James Inhofe, an Oklahoma Republican, said on Monday the leaked correspondence suggested researchers “cooked the science to make this thing look as if the science was settled, when all the time of course we knew it was not,” according to a transcript of a radio interview posted on his Web site. Aides for Rep. Darrell Issa, a California Republican, are also looking into the disclosure.

A few days after leaked e-mail messages appeared on the Internet, the U.S. Congress may probe whether prominent scientists who are advocates of global warming theories misrepresented the truth about climate change.

The leaked documents (see our previous coverage) come from the Climatic Research Unit of the University of East Anglia in eastern England. In global warming circles, the CRU wields outsize influence: it claims the world’s largest temperature data set, and its work and mathematical models were incorporated into the United Nations Intergovernmental Panel on Climate Change’s 2007 report. That report, in turn, is what the Environmental Protection Agency acknowledged it “relies on most heavily” when concluding that carbon dioxide emissions endanger public health and should be regulated.

Last week’s leaked e-mails range from innocuous to embarrassing and, critics believe, scandalous. They show that some of the field’s most prominent scientists were so wedded to theories of man-made global warming that they ridiculed dissenters who asked for copies of their data ("have to respond to more crap criticisms from the idiots"), cheered the deaths of skeptical journalists, and plotted how to keep researchers who reached different conclusions from publishing in peer-reviewed journals.

One e-mail message, apparently from CRU director Phil Jones, references the U.K.’s Freedom of Information Act when asking another researcher to delete correspondence that might be disclosed in response to public records law: “Can you delete any emails you may have had with Keith re AR4? Keith will do likewise.” Another, also apparently from Jones: global warming skeptics “have been after the CRU station data for years. If they ever hear there is a Freedom of Information Act now in the UK, I think I’ll delete the file rather than send to anyone.” (Jones was a contributing author to the chapter of the U.N.’s IPCC report titled “Detection of Climate Change and Attribution of Causes.")

In addition to e-mail messages, the roughly 3,600 leaked documents posted on sites including Wikileaks.org and EastAngliaEmails.com include computer code and a description of how an unfortunate programmer named “Harry”—possibly the CRU’s Ian “Harry” Harris—was tasked with resuscitating and updating a key temperature database that proved to be problematic. Some excerpts from what appear to be his notes, emphasis added:

I am seriously worried that our flagship gridded data product is produced by Delaunay triangulation - apparently linear as well. As far as I can see, this renders the station counts totally meaningless. It also means that we cannot say exactly how the gridded data is arrived at from a statistical perspective - since we’re using an off-the-shelf product that isn’t documented sufficiently to say that. Why this wasn’t coded up in Fortran I don’t know - time pressures perhaps? Was too much effort expended on homogenisation, that there wasn’t enough time to write a gridding procedure? Of course, it’s too late for me to fix it too. Meh.

Ulp! I am seriously close to giving up, again. The history of this is so complex that I can’t get far enough into it before by head hurts and I have to stop. Each parameter has a tortuous history of manual and semi-automated interventions that I simply cannot just go back to early versions and run the update prog. I could be throwing away all kinds of corrections - to lat/lons, to WMOs (yes!), and more. So what the hell can I do about all these duplicate stations?…

As the leaked messages, and especially the HARRY_READ_ME.txt file, found their way around technical circles, two things happened: first, programmers unaffiliated with East Anglia started taking a close look at the quality of the CRU’s code, and second, they began to feel sympathetic for anyone who had to spend three years (including working weekends) trying to make sense of code that appeared to be undocumented and buggy, while representing the core of CRU’s climate model.

One programmer highlighted the error of relying on computer code that, if it generates an error message, continues as if nothing untoward ever occurred. Another debugged the code by pointing out why the output of a calculation that should always generate a positive number was incorrectly generating a negative one. A third concluded: “I feel for this guy. He’s obviously spent years trying to get data from undocumented and completely messy sources.”

Programmer-written comments inserted into CRU’s Fortran code have drawn fire as well. The file briffa_sep98_d.pro says: “Apply a VERY ARTIFICAL correction for decline!!” and “APPLY ARTIFICIAL CORRECTION.” Another, quantify_tsdcal.pro, says: “Low pass filtering at century and longer time scales never gets rid of the trend - so eventually I start to scale down the 120-yr low pass time series to mimic the effect of removing/adding longer time scales!”

It’s not clear how the files were leaked. One theory says that a malicious hacker slipped into East Anglia’s network and snatched thousands of documents. Another says that the files had already been assembled in response to a Freedom of Information request and, immediately after it was denied, a whistleblower decided to disclose them. (Lending credence to that theory is the fact that no personal e-mail messages unrelated to climate change appear to have been leaked.)

For its part, the University of East Anglia has posted a statement calling the disclosure “mischievous” and saying it is aiding the police in an investigation.

The statement also quotes Jones, CRU’s director, explaining his November 1999 e-mail, which said: “I’ve just completed Mike’s Nature trick of adding in the real temps to each series for the last 20 years (ie from 1981 onwards) amd from 1961 for Keith’s to hide the decline.” Jones said that the word trick was used “colloquially as in a clever thing to do” and that it “is ludicrous to suggest that it refers to anything untoward.”

Also unclear is the ultimate impact of the leak, which came before next month’s Copenhagen summit and Democratic plans for cap and trade legislation.

On one hand, over at RealClimate.org, Gavin Schmidt, a modeler for the NASA Goddard Institute for Space Studies, has been downplaying the leak. Schmidt wrote: “There is no evidence of any worldwide conspiracy, no mention of George Soros nefariously funding climate research ... no admission that global warming is a hoax, no evidence of the falsifying of data, and no ‘marching orders’ from our socialist/communist/vegetarian overlords.”

On the other, groups like the free-market Competitive Enterprise Institute, the target of repeated derision in the leaked e-mails, have said: “We have argued for many years that much of the scientific case for global warming alarmism was weak and some of it was phony. It now looks like a lot of it may be phony.”

ScienceMag.org published an article noting that deleting e-mail messages to hide them from a FOI request is a crime in the United Kingdom. George Monbiot, a U.K. activist and journalist who previously called for dramatic action to deal with global warming, wrote: “It’s no use pretending that this isn’t a major blow. The emails extracted by a hacker from the climatic research unit at the University of East Anglia could scarcely be more damaging.”
Read more of this excellent coverage by CBS here.