---
title: "Climatic Research Unit documents"
chunk: 2/8
source: "https://en.wikipedia.org/wiki/Climatic_Research_Unit_documents"
category: "reference"
tags: "science, encyclopedia"
date_saved: "2026-05-05T04:22:39.055334+00:00"
instance: "kb-cron"
---

=== E-mails ===
Most of the e-mails concerned technical and mundane aspects of climate research, such as data analysis and details of scientific conferences. The controversy has focused on a small number of e-mails, particularly those sent to or from climatologists Phil Jones, the head of the CRU, and Michael E. Mann of Pennsylvania State University (PSU), one of the originators of the graph of temperature trends dubbed the "hockey stick graph".
Climate change deniers gained wide publicity for allegations that the hacked e-mails showed climate scientists colluded in manipulating data, withheld scientific information, and tried to prevent dissenting scientific papers from being published in peer reviewed journals. Academics and climate change researchers said that nothing in the emails proved wrongdoing, and dismissed the allegations. Independent reports said that the e-mails did not affect evidence that man made global warming is a real threat, and e-mails were being misrepresented to support unfounded claims of scientific misconduct, but there were disturbing suggestions that scientists had avoided sharing scientific data with sceptical critics.
The Information Commissioner's Office stated that "the prima facie evidence from the published e-mails indicate an attempt to defeat disclosure by deleting information. It is hard to imagine more cogent prima facie evidence. ... The fact that the elements of a [FOIA] section 77 offence may have been found here, but cannot be acted on because of the elapsed time, is a very serious matter." The Science and Technology Select Committee criticised the ICO for making "a statement to the press that went beyond that which it could substantiate", but also blamed the university for mishandling Freedom of Information requests and called for a full investigation to resolve the questions raised.
The Associated Press conducted a review of the e-mails and concluded that they showed scientists fending off critics, but did not support claims that global warming science had been faked. They stated that "One of the most disturbing elements suggests an effort to avoid sharing scientific data with critics skeptical of global warming", and mentioned ethical problems with this action due to the fact that "free access to data is important so others can repeat experiments as part of the scientific method". They cited a science policy expert as stating that it was "normal science politics, but on the extreme end, though still within bounds". The AP sent the emails to three climate scientists they selected as moderates, who did not change their view that man-made global warming is a real threat. The three scientists are on the record elsewhere supporting an outside, independent review of the allegations of misconduct at both the CRU and Pennsylvania State University.
Summarising its own analysis, FactCheck stated that claims by climate sceptics that the emails demonstrated scientific misconduct amounting to fabrication of global warming were unfounded, and emails were being misrepresented to support these claims. While the emails showed a few scientists being rude or dismissive, this did not negate evidence that human activities were largely responsible for global warming, or the conclusions of the 2007 Intergovernmental Panel on Climate Change report which used the CRU as just one of many sources of data.
An editorial in the scientific journal Nature stated that the e-mails had not shown anything that undermined the scientific case on human caused global warming, or raised any substantive reasons for concern about the researchers' own papers. Scientific openness requires public availability of data used to reach conclusions, but researchers had been hampered in this by contractual restrictions on some data, and in certain countries national meteorological services were too slow to provide data sets on request. The e-mail theft highlighted "the harassment that denialists inflict on some climate-change researchers, often in the form of endless, time-consuming demands for information under the US and UK Freedom of Information Acts. Governments and institutions need to provide tangible assistance for researchers facing such a burden." While scientists are human and "unrelenting opposition to their work can goad them to the limits of tolerance", they "should strive to act and communicate professionally, and make their data and methods available to others, lest they provide their worst critics with ammunition."
The IPCC's chairman, Rajendra Pachauri, described the CRU's scientists "as highly reputed professionals, whose contributions over the years to scientific knowledge are unquestionable" and described their datasets as "totally consistent with those from other institutions, on the basis of which far-reaching and meaningful conclusions were reached in the [2007 IPCC report]."
On 24 November the University of East Anglia issued a statement on the contents of the e-mails: "There is nothing in the stolen material which indicates that peer-reviewed publications by CRU, and others, on the nature of global warming and related climate change are not of the highest quality of scientific investigation and interpretation."
In its report to the Science and Technology Select Committee of the Parliament of the United Kingdom, the Institute of Physics stated that the emails reveal evidence of "determined and coordinated refusals" to comply with scientific traditions through "manipulation of the publication and peer-review system" and "intolerance to challenge". This report was used by climate sceptics to bolster claims that the problem of global warming is exaggerated. This forced the Institute of Physics to confirm that its position was that "the basic science is well enough understood to be sure that our climate is changing, and that we need to take action now to mitigate that change." Many experts considered that the correction was still inadequate, with climatologist Andy Russell describing the allegation of data suppression as "incorrect and irresponsible". The institute said that the statement had been prepared by their energy subcommittee, but would not reveal who had produced it. It did say that the subcommittee included an IOP official named Peter Gill, whose company provides services to the energy industry and who has written that for many people, the subject of anthropogenic global warming "has become a religion, so facts and analysis have become largely irrelevant". The institute said that Gill was not the main source of information and that other members of the sub-committee were also critical of CRU. Evan Harris, a Liberal Democrat member of the Science and Technology Select Committee, said "Members of the Institute of Physics ... may be concerned that the IOP is not as transparent as those it wishes to criticise." However the institute told the Guardian that the submission was "approved by three members of its science board" and supplied comments from an anonymous board member stating "The institute should feel relaxed about the process by which it generated what is, anyway, a statement of the obvious ... the points [the submission] makes are ones which we continue to support, that science should be practiced openly and in an unbiased way."

==== Climate reconstruction graph ====

The most quoted phrase took words from an e-mail of 16 November 1999 written by Phil Jones which referred to a graph he was preparing as a diagram for the cover of the World Meteorological Organization (WMO) statement on the status of global climate in 1999. Jones wrote: