Tom Segalstad

Tom Victor Segalstad


  • Ph.D., Geology/Geochemistry, University of Oslo. [1]


Tom Segalstad is an associate professor of Resource and Environmental Geology at the University of Oslo and head of the University’s Geological Museum. [2]

He has listed himself as an “Expert Reviewer” of the IPCC, which he has also mentioned at a media interview during the Heartland Institute’s International Conference on Climate Change.

Under his research interests he lists “CO2 and the ‘Greenhouse Effect,’ and to be more specific, “how CO2 simply cannot cause ‘global warming’.” [3]

Stance on Climate Change

“Man’s contribution to atmospheric CO2 from the burning of fossil fuels is small, maximum 4% found by carbon isotope mass balance calculations. The ‘Greenhouse Effect’ of this contribution is small and well within natural climatic variability […] The global climate is primarily governed by the enormous heat energy stored in the oceans and the latent heat of melting of the ice caps, not by the small amount of heat that can be absorbed in atmospheric CO2CO2 taxes’ to be paid by the public cannot influence on the sea level and the global climate.” [4]

Key Deeds

February 23, 2017

Tom Segalstad was a signatory of a petition (PDF) organized by Richard Lindzen of the Cato Institute urging President Donald Trump to pull the United States out of the United Nations international convention on climate change (UNFCCC). [10]

In just a few weeks, more than 300 eminent scientists and other qualified individuals from around the world have signed the petition below,” Lindzen wrote in the letter. [10]

DeSmog investigated the list, and found that only a small handful of the signatories could be considered “even remotely ‘qualified’ or ‘eminent’ — but not in the field of climate science.” The list included individuals “interested in climate,” and one signatory who only identified as an “emailer who wished to sign the petition” while some signers provided no affiliation or address whatsoever. [11]

May 21–23, 2012

Segalstad was a speaker at the Heartland Institute‘s 7th International Conference on Climate Change (ICCC7).

DeSmogBlog researched the co-sponsors behind Heartland’s ICCC7 and found that they had collectively received over $67 million from ExxonMobil, the Koch Brothers and the conservative Scaife family foundations.

Segalstad’s presentation, titled “Geochemistry of Carbon Dioxide: the whereabouts of carbon dioxide on Earth” can be viewed below.

May 16 – 18, 2010

Segalstad spoke at the Heartland Institute‘s Second International Conference on Climate Change (ICCC2). His presentation, titled “Geochemistry of Carbon Dioxide, the whereabouts of Carbon Dioxide on Earth” can be viewed below.

March 9, 2009

Segalstad spoke at the Heartland Institute‘s Second International Conference on Climate Change. He was interviewed by The New American during the conference where he contended that ice core samples are not representative of global Co2 levels. [5], [6]

His presentation, titled  “Carbon Isotope Mass Balance Modeling of Atmospheric vs. Oceanic CO2” can be viewed below. 

During the interview, Segalstad mentions that he was a “expert reviewer to the IPCC,” and that he had asked why his scientific paper (PDF) was not included in the report. When asked further about the IPCC, Segalstad said he “was not that close to the core of the IPCC.”

June 23, 2009

Was one of a list of “Commentors” to submit a document to the EPA titled “A Scientific Challenge of EPA‘s Proposed Finding of Endangerment that CO2, Methane, Nitrous OXide, Hydrofluorocarbons, Perflouorocarbons, and Sulfur Hexafluoride, Collectively on Individually, Are Causal Agent(s) or Contributors of Climate Change” (PDF).

The commentors conclude that “[…] there is no ’cause and effect’ relationship between CO2 and GTA [Global Temperature Anomalies].”

Similar petitions (PDF) were released by the Southeastern Legal Foundation targeting the EPA’s Endangerment Finding, with one (PDF) citing Segalstad as a source. The EPA Responded to Southeastern Legal, stating that “Segalstad’s work ‘does not address the lifetime of a change in atmospheric concentration of CO2, but rather the lifetime in the atmosphere of an individual molecule of CO2‘ and that these ‘are two different concepts’.”

Southeastern Legal lists its partners in their effort to reverse the EPA endangerment finding as the Science & Public Policy Institute, as well as “like-minded organizations” such as the Competitive Enterprise Institute, Heritage Foundation, CATO Institute, and the Independent Women’s Forum, among others.

March 2008

Segalstad is listed as a signatory to the Manhattan Declaration on Climate Change that was first introduced at the Heartland Institute’s 2008 International Conference on Climate Change. [7]

The Manhattan Declaration asserts that “human-caused climate change is not a global crisis,” that “(CO2) is not a pollutant but rather a necessity for all life,” that industrial carbon dioxide emissions do not affect climate change, and that “warmer weather is generally less harmful to life on Earth than colder.”


Segalstad’s name appears on a submission (PDF) from the Lavoisier Group to the Garnaut Climate Change Review.

The letter states that “The argument put forward by protagonists for decarbonization that there is a scientific ‘consensus’ behind theories of a climate controlled by atmospheric carbon dioxide is clearly an attempt to silence critics, and should be treated with contempt.”

His name also appeared on the original letter to UN Secretary-General Ban Ki-Moon that argued the science was not settled on climate change. [8]



A search of Current Research Information SysTem In Norway (Cristin) comes up numerous publications by Tom Seglstad on the subject of climate. Note that this list includes newspaper articles and journals that may not have been subjected to peer review.

  • The distribution of CO2 between atmosphere, hydrosphere, and lithosphere; minimal influence from anthropogenic CO2 on the global ‘Greenhouse Effect’” (PDF). Published 1996 In Emsley, J. (Ed.): The Global Warming Debate. The Report of the European Science and Environment Forum. Bourne Press Ltd., Bournemouth, Dorset, U.K., pp. 41-50.
  • “Carbon cycle modelling and the residence time of natural and anthropogenic atmospheric CO2: on the construction of the ‘Greenhouse Effect Global Warming’ dogma” (PDF). Published 1998: In Bate, R. (Ed.): Global warming: the continuing debate. ESEF, Cambridge, U.K., pp. 184-219.
  • Jaworowski, Z.P., Segalstad, Tom Victor; Ono, N. “Do glaciers tell a true atmospheric CO2 story?” (PDF), Science of the Total Environment, August 199, Volume 114. p. 227-284.  
  • Singer, S.F., Segalstad, Tom Victor. “Nature, not human activity, rules the climate”(PDF), Chicago, USA.: The Heartland Institute. 2008 40 p.
  • Solomon, L., Segalstad, Tom Victor. “The Deniers. The world-renowned scientists who stood up against global warming hysteria, political persecution, and fraud — and those who are too fearful to do so.” USA.: Richard Vigilante Books. 2008, 8 p.
  • Jaworowski, Z.P., Segalstad, Tom Victor; Hisdal, V. “Atmospheric CO2 and global warming: a critical review.” Second Revised Edition. Meddelelser / Norsk polarinstitutt 1992 (119) p. UiO
  • Jaworowski, Z.P., Segalstad, Tom Victor; Hisdal, V. Atmospheric CO2 and global warming: a critical review. Rapportserie 1990 (59).
  • Segalstad, Tom Victor. Commentary: “The Construction of Dogmas in Climate Science.” European Committee For a Constructive Tomorrow (CFACT Europe). 2006 1 p.

Other Publications and Public Appearances

  • Segalstad, Tom Victor. “En helt vanlig dag for CO2 på jobben – hva kan geokjemi fortelle om hva CO2 gjør i naturen?” Klimarealistene. 2010-10-30.
  • Segalstad, Tom Victor. “Er CO2 vår venn eller fiende?.” Teknas klimaseminar
  • Segalstad, Tom Victor; De Rosa, Maria. Forskningens “klimakjettere.” Universitas [Newspaper] 2010-01-20.
  • Segalstad, Tom Victor. “Carbon isotope mass balance modelling of atmospheric vs. oceanic CO2.” International Conference on Climate Change, New York, 9 Mar. 2009. Chicago.: Heartland Institute. 30 p.
  • Segalstad, Tom Victor. “Correct timing is everything – also for CO2 in the air.” CO2 Science,  Vol. 12, No. 31 (5 August 2009).. St. Louis. 2009 4 p.
  • Segalstad, Tom Victor. “CO2 geochemistry, carbon cycle and ocean acidification. Climate Conference: ‘Have humans changed the climate? Facts and consequences’.” European Parliament, Brussels, 18 November 2009. Brussels. European Parliament. 2009 43 p.
  • Segalstad, Tom Victor. “Global climate change.” The New American. [TV] 2009-03-09. 
  • Segalstad, Tom Victor. “High scores for ice cores? Are ice cores really a climate archive?.” New York, 9 Mar. 2009. International Conference on Climate Change.; 2009-03-09.
  • Segalstad, Tom Victor. “Hva er CO2 – venn eller fiende?” Møte
  • Segalstad, Tom Victor. “Carbon isotope mass balance modelling of atmospheric vs. oceanic CO2.” 33rd International Geological Congress.; 2008-08-09.
  • Segalstad, Tom Victor. “CO2 og klima.” FEM TV. [TV] 2008-03-18.
  • Tjersland, Jonas; Segalstad, Tom Victor. “Klimatrusselen: Refser panelet han var ekspert for.” Verdens Gang (VG), side 10. [Newspaper] 2008-01-08.
  • Goldberg, Fred; Segalstad, Tom Victor; Kalinkin, Alexander. “Gas emission / global warming and mining in the Arctic.” 9th International Symposium on Mining in the Arctic (9th ISMA
  • Segalstad, Tom Victor. “What is CO2 – friend or foe?.” Kjeøy Research & Education Center, 9th International Symposium on Mining in the Arctic (9th ISMA), page 7-8. 2007 2 p.
  • Segalstad, Tom Victor. “CO2 og klima.” Foredrag, 2005-11-01. 
  • Segalstad, Tom Victor. “CO2 og klima – tukler vi med Jordens termostat?” Norsk oljerevy, 1996 Volume 22. (10) p.


  1. “Submission from the Lavoisier Group to the Garnaut Climate Change Review” (PDF), The Lavoisier Group. Accessed February, 2012.
  2. Tom Victor Segalstad: Associate Professor – Department of Research and Collections,” University of Oslo Natural History Museum. Accessed February, 2012. Archived with WebCite, February 13, 2012.
  3. Biography of Tom Victor Segalstad,” University of Oslo (personal website), October 25, 2010.
  4. Tom V. Segalstad. “The distribution of CO2 between atmosphere, hydrosphere, and lithosphere; minimal influence from anthropogenic CO2 on the global ‘Greenhouse Effect’” (PDF), University of Oslo (Personal Webpage), December, 1995. Original report from Emsley, J. (Ed.) 1996: The Global Warming Debate. The Report of the European Science and Environment Forum. Bourne Press Ltd., Bournemouth, Dorset, UK.
  5. “Second International Conference on Climate Change,” (PDF) Heartland Institute. Archived January 4, 2018. 
  6. Dr Tom Segalstad on Global Climate Change,” YouTube Video. Uploaded by user RemnantMan, March 18, 2009.
  7. QUALIFIED ENDORSERS NOT AT CONFERENCE,” International Climate Science Coalition. Accessed February, 2012.
  8. Open Letter to the Secretary-General of the United Nations,” December 13, 2007. Reprinted by the Science & Public Policy Institute.
  9. Heartland Experts: Tom Segalstad,” The Heartland Institute. Accessed February 13, 2012.
  10. PETITION” (PDF), February 23, 2017. Richard Lindzen. PDF Archived at DeSmog.
  11. Graham Readfearn. “Climate Science Denier Richard Lindzen’s List of 300 “Scientists” Sent to Trump Is the Usual Parade of Non-Experts,” DeSmog, February 27, 2017.
  12. Robert Nilsson. “Environmental Tobacco Smoke Revisited: The reliability of the evidence for risk of lung cancer and cardiovascular desease,” The European Science and Environment Forum, March 1998. Retrieved from Truth Tobacco Industry Documents library. Bates Number : 518988738-518988770.

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