Principia Scientific International

Principia Scientific International


Principia Scientific International (PSI) is an organization based in the United Kingdom which promotes fringe views and material to claim that carbon dioxide is not a greenhouse gas. PSI was formed in 2010 around the time they published their first book, titled Slaying the Sky Dragon: Death of the Greenhouse Gas Theory. [1]

PSI claims it provides its members with a “reliable port of call to ascertain the facts behind the news stories to better judge whether information being presented by third parties is accurate information and reflects a balanced view of all facets of the subject.” [2]

The PSI website says the organization is “for everyone who supports the traditions [sic] scientific method against the rise of sinister and secretive government funded 'post normal science'.”

The group claims on its website to be a “not-for-profit community interest subsidiary of PSI Acumen Ltd.”  [2]

PSI Acumen was registered with Companies House in the UK in March 2013 (see PDF) as a private company, with an address in Battersea Park Road, London. In July 2013, the business address of PSI Acumen was changed (PDF) to an address in Great Yarmouth, Norfolk, which is the same as the home address of John O'Sullivan, the organization's founder and chief executive officer. PSI Acument LTD was dissolved (PDF) on October 15, 2014. [3], [4], [5]

The two named directors were John O'Sullivan, of the UK, and a Walter James O'Brien, with a US address listed in Fargo, North Dakota. Emails published by climate skeptic blogger Pete Ridley suggest that Walter James O'Brien no longer has any connection to the PSI Acument company. [3], [6]

Principia Scientific reports that one of their “proudest endeavors is the ongoing support given to world-leading independent climatologist, Dr Tim Ball,” who is also a founding member and former chairman of PCI.  [7]

Stance on Climate Change

PSI regularly publishes commentary which claims that carbon dioxide is not a greenhouse gas and that it could actually cool the planet. For example, in an article published in November 2013, “PSI Staff” wrote: [8]

Scientists at Principia Scientific International (PSI), who peer-reviewed Nahle's paper, are currently advising colleagues that the most reliable data available now confirms that CO2 is shown to act as a coolant in earth's climate. As such, the notion of a so-called 'greenhouse gas' warming effect may be regarded as refuted, while environmental measures by governments and individuals to reduce “carbon emissions”  to combat climate change are, in turn, rendered pointless. 

In 2013, PSI also began to promote unfounded claims that wind turbines make people sick and that childhood vaccines were “one of the largest most evil lies in history.” [9]


PSI is described on its website as being part of PSI Acumen Ltd — a private company registered in the UK with two named directors. No accounts have been filed for the company.

PSI asks for donations on its website and also seeks members. Membership is free, but PSI asks people applying to make a voluntary donation (they suggest about $30). According to their website, [2]

PSI is not beholden for its funds to any corporation, political party or undisclosed source. PSI functions on the income generated from its members and stakeholders ostensibly via book sales, consultancy fees and unsolicited charitable donations.”

Key People

According to the Principia Scientific's website: [10]

  • John O'Sullivan — Chief Executive Officer & Founding Member
  • Terry (Terri) Jackson  Recruitment Officer
  • Tim Ball  Founder member and former Chairman [11]
  • John Sanderson  Chairman
  • Dr Pierre R. Latour Vice Chairman (North) [12][6]
  • John N Elliston  Vice Chairman (South) [6]
  • Hans Schreuder  Chief Financial Officer


PSI maintains a “selected” list of members and “friends/supporters” on its website. Among them are: [10]

In 2012, climate blogger Pete Ridley claimed that several people previously listed as members of PSI have withdrawn. [6]

An entry on the PSI website from May 2013 said that Russian physicist Habibullo Ismailovich Abdussamatov had “resigned,” but a list accessed by DeSmogBlog in December 2013 still had Dr Abdussamatov as a member.


July, 2013

Principia Scientific International (PSI) offers to host a sacked Australian climate skeptic professor, Dr Murry Salby, for speaking engagements in London. [13]

PSI says it has secured funding from publisher Stairway Press for the trip. A later website entry made during Salby's trip says that Ken Coffman, of Stairway Press, had donated a four figure sum to cover expenses for the Salby trip, which consisted (PDF) of two speeches in London, one in Cambridgeshire, and two more in Edinburgh. [14], [15]

A speech given in the UK parliament was sponsored by British Labour Party MP Graham Stringer and attended by PSI membership officer Terri Jackson. A speech given in the Scottish Parliament was hosted by Scottish Conservative Party MSP Murdo Fraser. [16], [17]

May, 2013

In April and May 2013, PSI chief executive John O'Sullivan became embroiled in a public row with prominent climate science denier Lord Christopher Monckton.

O'Sullivan wrote a letter to Monckton, saying he should not accept the basic physics showing carbon dioxide was a “greenhouse gas.” [18]

O'Sullivan wrote: “Greenhouse gas predictions (and thus the science) are shown to be wrong.”

Monckton wrote back, describing O'Sullivan as “confused and scientifically illiterate.” O'Sullivan responded, saying Monckton's “belief in the greenhouse gas 'theory' is premised on misunderstandings, misrepresentations and half truths.” [19], [20]

May, 2013

The Australian newspaper's environment editor Graham Lloyd cites Principia Scientific International in a news article suggesting there was a debate among scientists about the possibility of a coming ice age. The story cited an interview with Dr Habibullo Ismailovich Abdussamatov published on the PSI website. The interview had actually been published more than five years earlier on the Canadian National Post website. [21]

Dr Abdussamatov “resigned” his membership of PSI soon after.

January, 2011

John O'Sullivan launches a crowd-funding campaign to raise cash for PSI.  As of December 2013, the campaign had raised just $450 of its stated $15,000 goal. The plea for funds said: [22]

Give generously for this good cause knowing you can help to counter the creeping folly of misguided societies that appear to have been commandeered by political lobbyists and shills serving self-interested corporations or misguided national governments.

November 2010

According to the PSI website, the organization was originally conceived after several authors came together to write the book “Slaying the Sky Dragon: Death of the Greenhouse Gas Theory.” [1]

The book, published in November 2010 online and then in print by Stairway Press in January 2011, claims to be the “only full volume refutation of the greenhouse gas theory of man-made global warming.”

Authors listed were John O'Sullivan, Hans Schreuder, Claes Johnson, Tim Ball, Charles Anderson, Alan Siddons, Joseph A. Olson and Martin Hertzberg.

Related Organizations

PSI appears to have no official affiliations with any other organizations.


  1. John O'Sullivan. “Principles of Association,” Principia Scientific International, September 20, 2010. WebCite URL

  2. John O'Sullivan. “Support & Advice,” Principia Scientific International, July 19, 2011. WebCite URL

  3. “Certification of Incorporation of a Private Limited Company: Company No. 8428391,” Registrar of Companies for England and Wales, March, 2013. Archived .pdf on file at DeSmogBlog. 

  4. AD01: Change of registered office Address” (PDF), Department of Business Innovation and Skills. Retrieved form Companies House UKArchived .pdf on file at DeSmogBlog.

  5. “Dissolved: 8428391” (PDF), Companies House UKArchived .pdf on file at DeSmogBlog.

  6. Spotlight On PSI and PSI Acumen Ltd.“ Global Political Shenanigans, June 16, 2012. Archived October 22, 2015. WebCite URL 

  7. John O'Sullivan. “Funding Our Work in 2015 - Your Donation Sought,” Principia Scientific. January 23, 2014. Archived October 22, 2015. WebCite URL

  8. Science Confirmed: Carbon Dioxide & Water Vapour Cools Earth's Atmosphere,” Principia Scientific International, November 20, 2013. Archived October 22, 2015. WebCite URL

  9. Andrew Baker. “The Vaccine Hoax Is Over?” Principia Scientific International, December 6, 2013. Archived October 22, 2015. WebCite URL 

  10. John O'Sullivan. “A Selection of Member Biographies,” Principia Scientific, September 20, 2010. WebCite URL

  11. John O'Sullivan. “Principia Scientific International (PSI): Serving the community,” December 14, 2010. Archived October 22, 2015 WebCite URL

  12. Pierre Latour PE. “Engineering Earth's Thermostat with CO2?” Principia Scientific International, April 16, 2013. Archived October 22, 2015. WebCite URL

  13. John O'Sullivan. “Scientist Fired by University for Exposing Truth on Climate Fraud,” Principia Scientific, July 9, 2013. WebCite URL

  14. Derek Alker. “On Professor Murray Salby's Edinburgh Talk: November 7, 2013,” Principia Scientific, November 11, 2013. Archived October 22, 2015. WebCite URL

  15. “Prof. Murry Salby UK TOUR: 4th Nov - 8th Nov Schedule” (PDF), Stairway Press. Archived .pdf on file at DeSmogBlog.

  16. Rev Philip Foster and Terri Jackson lead Professor Murry Salby in climate debate in House of Commons,” Terri Jackson's Scientific Blog, November 8, 2013. Archived October 22, 2015. WebCite URL

  17. So much for the consensus on climate change,” Patrick Harvie MSP, November 9, 2013. Archived October 22, 2015. WebCite URL

  18. John O'Sullivan. “Open Letter Challenge to Greenhouse Gas Promotor Lord Moncton,” Principia Scientific, April 9, 2013. Archived October 22, 2015. WebCite URL

  19. Lord Moncton Replies to John O'Sullivan's Open Letter,”  Principia Scientific, April 23, 2013. Archived October 22, 2015. WebCite URL

  20. John O'Sullivan. “Lord Moncton's Appeal to Authority Backfires in Greenhouse Gas Debate,” Principia Scientific, May 3, 2013. Archived October 22, 2014. WebCite URL

  21. The Australian Brings You The Climate Science Denial News From Five Years Ago,” Graham Readfearn, May 10, 2013.

  22. PSI: Politics-free Science Association,” (Campaign), GoFundMe. Archived May 1, 2013.