- PhD, Geology, Yale University (1968). 
- MS, Geology, University of Colorado (1962). 
- BA, Geology major, Yale University (1960). 
A February 2007 profile in Philadelphia Magazine described Giegengack as a “relatively obscure geologist who taught more than he published” who later “stepped into the swirling tempest surrounding global warming, in part because he says it’s not even one of the top 10 environmental problems we face.” 
“Geologist Dr. Robert Giegengack, chaired the Department of Earth and Environmental Science at the University of Pennsylvania for 12 years. Has done field research on six continents, conducted peer-review studies on the geological archives of climate and spent much of his academic career doing field work on the history of climate. Authored 200 peer-reviewed papers. Giegengack: ‘CO2 is not the villain that it has been portrayed.”
According to his archived profile at the University of Pennsylvania, Giegengack has been a geology professor at both Yale University and the University of Pennsylvania. From 1975 to 1976 he worked as a Geologo Asesor (Geologist/Advisor) to the Ministry of Energy and Mines at the Government of Venezuela ( Ministerio de Energia y Minas, Republica de Venezuela).
CFACT features Giegengack in its sequel, Climate Hustle 2, which premiered in September 2020. Between 1998 and 2007, CFACT has received at least $582,000 from oil giant ExxonMobil. In 2019, CFACT was also named as a creditor in Murray Energy‘s bankruptcy filings. 
Stance on Climate Change
November 11, 2019
- “Global Warming/Climate Change began as a scientific discussion. It has evolved into a polarizing political argument (whenever a scientific understanding depends on a ‘consensus’, we know it has become political), and from there to a semi-religious campaign advanced by well-intended people who feel, deep in their hearts, that they are ‘saving the planet’. Many of those people have chosen to allow their good intentions to override their scientific objectivity. As soon as people who disagree about scientific conclusions start calling each other pejorative names, we know that the discussion has become primarily political, not scientific.
- “I know the work of [MIT’s Dr. Richard] Lindzen, [Climatologist Dr. Roy] Spencer, [Georgia Tech Climatologist Dr. Judith] Curry, [Climatologist Dr. John] Christy, [Princeton Physicist Dr. Will] Happer, etc. I share the skepticism that these people have expressed that anthropogenic CO2 emissions represent the primary driver of the climate change now under way.
- “We know that the climate ‘warmed’, with a few unexplained reversals, from ~18,000 years ago until ~1830 AD, as a consequence of factors that have controlled climate for all of Phanerozoic time. It defies the imagination to suggest that those factors abruptly ceased to operate ~300 years ago just to accommodate our need to attribute contemporary climate change to human activity.
- “It beggars the imagination to assert that the natural factors that drove the warming trend from 18,000 years ago to ~300 years ago (with some unexplained temperature reversals) abruptly stopped operating at the end of the Little Ice Age to accommodate our political need to attribute climate variability to human industrial activity.
- “Climate models are instructive, but they lead to scenarios, not predictions. They can be manipulated to yield desired outputs.
- “Removing the groundwater contribution, not directly the consequence of climate change, yields a rate of global sea-level rise that is the slowest in the last 18,000 years. In prior ‘interglacial’ times, most recently to ~125,000 years ago, global sea level rose to levels higher than the present sea level, and no humans were burning fossil fuels.
- “We run an insidious risk: When/if a) we learn that anthropogenic CO2 is not the primary driver of contemporary climate change; b) we drastically reduce anthropogenic output of CO2 and the climate does not respond as we have predicted; or c) we enter a period of unexplained cooling, as the mid-20th-century cooling episode, or the Little Ice Age, the credibility of climate scientists will be dashed, and with it the credibility of any scientist who tries to inform environmental policy via rigorous science.”
December 7, 2015
On the 97 percent consensus around man-made climate change, Giegengack commented:
“That’s a marketing… that’s an advertising ploy. I don’t think it means anything. I don’t think 97 percent of the people who look at the climate data critically share the opinion that anthropogenic emissions of CO2 is a primary driver of climate.”When asked “is carbon dioxide the control knob [for climate change],” Giegengack responded:
“I don’t see anything in the long-term geologic record to support that conclusion. CO2 is one of many, many, many variables that influence the Earth’s temperature.”
Morano: “Are you afraid of rising CO2 concentrations?
Giegengack: “No. No I’m not. CO2 is not the villain that it has been portrayed.”
He later suggested climate is colder than it’s ever been:
“I’m impressed by the fact that the present climate, from the perspective of a geologist, is very close to the coldest it’s ever been. The concentration of CO2 in the atmosphere today is closest to the lowest it’s ever been.”
On Al Gore:
“I voted for [Al] Gore in 2000, yea. And I think that if he ran again, depending on who he ran against, I might vote for him. He’s a smart man.”
Hover, regarding Gore’s film An Inconvenient Truth, Giegengack said:
“[cuts in…] I was appalled. I was appalled because he either deliberately misrepresented the point it was making, or didn’t understand it. So it was irresponsible of Al Gore [cuts off]”
October 26, 2007
“The driving mechanism is exactly the opposite of what Al Gore claims, both in his film and in that book. It’s the temperature that, through those 650,000 years, controlled the CO2CO2 that controlled the temperature.”
Giegengack was interviewed in an issue of The Pennsylvania Gazette, the alumni magazine for the University of Pennsylvania. During the interview, Giegengack voiced his displeasure about Al Gore’s film, An Inconvenient Truth. 
“I’m just unhappy about the way Gore presented it,” he said. Giegengack claimed Gore produced “a political statement [that] has to go head-to-head with what comes out of Washington or the American Petroleum Institute.” 
According to the Gazette’s Carter Johns, “Giegengack contends that natural warming periods in our planet’s past have triggered the release of CO2 into the atmosphere from ocean- and land-based reservoirs, and that the most significant consequence of human fossil-fuel consumption is that we have altered that balance by pouring CO2 into the atmosphere and those terrestrial reservoirs simultaneously. Since that relationship has been disturbed, he says, even a drastic reduction in CO2 pollution may not restore the natural dynamic.” 
Below are some of the questions and answers from that interview:
Q: What is your assessment of the threat global warming poses to the environment?
A: There are plenty of environmental problems out there; most of them are the consequence of a lot of people using a lot of energy. Global warming is a symptom of that fundamental problem. It’s one of many symptoms; it’s not the most severe. In terms of its capacity to cause the human species harm, I don’t think it makes it into the top 10.
Q: What problem do you have with Gore’s film?
The advocates of change are now appealing to fear as brazenly as the proponents of business-as-usual. [The latter] tell us we can’t afford to cut back on our carbon emissions because it would destroy the economy. The other side says the world is going to hell and the polar bears are drowning. Both are extreme positions. Scientists have gotten tied up in this political argument because they were frustrated that the politicians weren’t paying attention to what they said. In order to make the message more apparent to the public, they’re exaggerating the risks. An Inconvenient Truth is a prime example.
Q: What are some examples of these misleading statements?
A: He claims that temperature increases solely because more CO2 in the atmosphere traps the sun’s heat. That’s just wrong … It’s a natural interplay. As temperature rises, CO2 rises, and vice versa. Variations in planetary alignment are most likely responsible … When gravitation from other planets’ orbits causes the Earth to move closer to or further from the sun, temperatures increase or decrease. When we find that CO2 levels follow that directly, it’s hard for us to say that CO2 drives temperature. It’s easier to say temperature drives CO2.
Q: What response have you gotten about your thoughts on the film?
A: People appreciated that I was drawing attention to the weaknesses in the film. Al Gore missed out on a really terrific opportunity with his name recognition, his access to these resources, and his pretty good understanding of climate processes. He could have put together a film that would have presented this problem in a rational context, and that would have been an enormous contribution. But he has abandoned the credibility of the scientific establishment. He missed the point in studying the cycles from prior periods, and he missed the point that it is the temperature that controls the CO2. Now, we have probably changed that because of the excess CO2 in the atmosphere, and we know or suspect that because we know we have reversed the flux. That’s probably the most significant finding: that we changed the way those systems operate. (Emphasis added).
Q: So it’s not that Gore is wrong, but that he portrayed the “crisis” inaccurately?
A: He focused on fear. CO2 may make this change, but we’d like to be sure of that. And even if it does, he didn’t offer any solution, and neither has anybody else. He ignored the real threat, which is India and China, and he ignored other more immediate environmental problems.
“None of the strategies that have been offered by the U.S. government or by the EPA or by anybody else has the remotest chance of altering climate if in fact climate is controlled by carbon dioxide,” Giegengack was quoted by Marc Morano at Climate Depot. 
September 24, 2020
Giegengack appeared in Marc Morano’s 2020 film Climate Hustle 2: Rise of the Climate Monarchy, produced by the Committee for a Constructive Tomorrow (CFACT). He questioned the scientific consensus on the causes of climate change, stating: 
“you don’t find strong empirical support for the idea that atmospheric concentrations of CO2 are the primary drivers of atmospheric temperature and global climate.”
In reference to the consensus among scientists on man-made global warming, Morano asked Giegengack: “are 97% of your colleagues against you?” to which he responded:
“I think the people with a geologist’s perspective on the history of climate do not share the consensus that anthropogenic emissions of CO2 are the primary driver of climate.”
December 7, 2015
Robert Giegengack appeared in the first Climate Hustle movie, which made its world premiere in Paris, France during the United Nations COP21 climate summit. Other “Key Scientists” featured in the first Climate Hustle included: 
- Patrick Moore
- Judith Curry
- Richard Tol
- Ivar Giaever
- Roy Spencer
- Don Easterbrook
- Bob Carter
- Patrick Michaels
- Christopher Monckton
- Anthony Watts
- Walter Cunningham
- William Briggs
- Roger Pielke Sr.
- Caleb Rossiter
- Daniel Botkin
- John Theon
- Dennis Rancourt
October 26, 2007
Giegengack’s work was cited in a floor speech by Republican senator from Oklahoma, Jim Inhofe, given to the U.S. Senate Committee on Environment & Public Works. In the speech, entitled “Global Warming Alarmism Reaches A Tipping Point”, Inhofe stated: 
“Perhaps the most scathing indictment of the ‘more CO2 equals a warmer world’ simplicity comes from Ivy League geologist Dr. Robert Giegengack, the chair of Department of Earth and Environmental Science at the University of Pennsylvania. Giegengack voted for Gore in 2000 and says he would do so again, but he is appalled by Gore’s ignorance of climate science. 
He tells his undergraduates: ‘Every single one of you knows more about [global warming] than Al Gore.’ 
Giegengack said: ‘[Gore] claims that temperature increases solely because more CO2 in the atmosphere traps the sun’s heat. That’s just wrong … It’s a natural interplay.’ He continued, ‘It’s hard for us to say that CO2 drives temperature. It’s easier to say temperature drives CO2.’ 
‘The driving mechanism is exactly the opposite of what Al Gore claims, both in his film and in that book. It’s the temperature that, through those 650,000 years, controlled the CO2CO2 that controlled the temperature,’ he added. 
Now this might be a bit technical, but what Giegengack is saying here is that it is temperatures that control CO2. This is crucial to understanding the reason why the scientific underpinnings of man-made global warming fears are utterly collapsing and the climate models are continuing to fail.” 
- University of Pennsylvania — Emeritus professor and former chairman of the Earth & Environmental Science department. , 
- Yale University — Geologist, Yale University Prehistoric expedition to Nubia, Egypt, 1963-67. Acting instructor, Yale University Geology Department, 1966-67. Assistant in Research, Peabody Museum of Natural History (1967–1968). 
- Ministry of Energy and Mines at the Government of Venezuela ( Ministerio de Energia y Minas, Republica de Venezuela) — Geologo Asesor (Geologist/Advisor), 1975-76. 
- Institute of Environmental Studies at the University of Pennsylvania— Co-Director, 1992-1998. 
His archived profile at the University of Pennsylvania also lists publications, including a piece on sunspots published in Geophys. Res. Letters. 
- “People: Robert Giegengack,” Department of Earth & Environmental Science at Penn State University. Archived September 23, 2020. Archive URL: https://archive.vn/5o6mi
- “Emeritus Faculty,” Department of Earth & Environmental Science at Penn State University. Archived September 23, 2020. Archive URL: https://archive.vn/cneTH
- “ROBERT GIEGENGACK,” Department of Earth and Environmental Science at the University of Pennsylvania. Archived October 7, 2000. Archive URL: https://archive.is/LV53X
- “Al Gore Is a Greenhouse Gasbag,” Philadelphia Magazine, February 2007. Archived February 26, 2007. Archive URL: https://archive.is/67OPh
- “Background on Key Scientists Appearing in Climate Hustle,” Climate Hustle. Archived August 15, 2019. Archived .pdf on file at DeSmog.
- Lee Fang. “COAL GIANT PROVIDED SECRET FINANCING TO GROUP CHALLENGING CLIMATE LAWSUITS,”The Intercept, December 17, 2019. Archive.ph URL: https://archive.ph/hUjRt
- Marc Morano. “Prominent Geologist Dr. Robert Giegengack dissents – Laments ‘hubris’ of those who ‘believe that we can ‘control’ climate – Denounces ‘semi-religious campaign’,” Climate Depot, November 11, 2019. Archived September 24, 2020. Archive.fo URL: https://archive.fo/wip/X4n0j
- Climate Hustle (2015) video on file at DeSmog.
- “Part 2: 2007: Global Warming Alarmism Reaches A Tipping Point,” U.S. Senate Committee on Environment & Public Works, October 26, 2007. Archived September 23, 2020. Archived .pdf on file at DeSmog.
- “An Inaccurate Truth?” The Pennsylvania Gazette (May/June 2007). Archived September 23, 2020. Archive URL: https://archive.vn/MoKA0
- “Trump ignores Gore’s advice, instead picks skeptic to head EPA & dismantle climate agenda,” Climate Depot, December 7, 2016. Archived September 23, 2020. Archive URL: https://archive.vn/ua5o4
- “Robert Giegengack,” Google Scholar. Accessed September 24, 2020. Archive.fo URL: https://archive.fo/r5M7v
- “Robert Giegengack,” ResearchGate. Archived September 24, 2020. Archive.fo URL: https://archive.fo/064C6
- Climate Hustle 2: Rise of the Climate Monarchy. CFACT/ CDR Communications, Inc., 2020