Big Oil Climate Denial Funding — Exxon Knew

Overview

Documents revealed that ExxonMobil’s own scientists confirmed climate change by the late 1970s, but the company funded decades of denial campaigns — a confirmed corporate conspiracy.

Origins & History

This is not a conspiracy theory in the traditional sense. It is a confirmed corporate conspiracy, documented through internal company records, congressional testimony, investigative journalism, and peer-reviewed research. The story begins in the late 1970s, when fossil fuel companies possessed private scientific knowledge about climate change — and made a deliberate, coordinated decision to suppress it.

In 1977, James Black, a senior scientist at Exxon’s Corporate Research division, delivered a presentation to the company’s Management Committee. His message was direct: “In the first place, there is general scientific agreement that the most likely manner in which mankind is influencing the global climate is through carbon dioxide release from the burning of fossil fuels.” Black warned that doubling atmospheric CO2 would raise global temperatures by 2 to 3 degrees Celsius and that this could produce “dramatic environmental effects before the year 2050.”

Exxon took the warning seriously — initially. Between 1978 and 1983, the company invested in a sophisticated internal climate research program. Exxon scientists installed carbon dioxide monitoring equipment on the company’s largest supertanker, the Esso Atlantic, to measure ocean absorption of CO2. They built climate models, published findings in peer-reviewed journals, and circulated internal reports that tracked closely with (and sometimes exceeded) the accuracy of contemporary academic climate science.

Then the strategy shifted. In the mid-1980s, as political momentum for climate regulation began building — the World Meteorological Organization and the UN Environment Programme established the Intergovernmental Panel on Climate Change (IPCC) in 1988 — Exxon pivoted from research to doubt. Internal documents from this period show a deliberate campaign to reframe the scientific consensus on climate change as uncertain and contested.

In 1989, Exxon helped found the Global Climate Coalition (GCC), an industry lobbying group that spent the next decade fighting climate regulations. Members included the American Petroleum Institute, Chevron, Shell, Ford, and General Motors. The GCC lobbied against the Kyoto Protocol, funded advertising campaigns questioning climate science, and circulated talking points emphasizing “uncertainty” in climate models — even as its own internal scientific advisory committee acknowledged in a 1995 primer that “the scientific basis for the Greenhouse Effect and the potential impact of human emissions of greenhouse gases such as CO2 on climate is well established and cannot be denied.”

Charles and David Koch, whose Koch Industries is one of the largest privately held fossil fuel conglomerates in the United States, funded a parallel network of organizations promoting climate skepticism. The Cato Institute, the Heritage Foundation, the Competitive Enterprise Institute, and the Heartland Institute all received Koch funding and produced materials challenging the scientific consensus. The Heartland Institute gained particular notoriety for hosting annual International Conference on Climate Change events that brought together prominent skeptics and for its “NIPCC” (Nongovernmental International Panel on Climate Change) reports, designed to provide a counter-narrative to the IPCC.

The story broke into mainstream public consciousness in 2015. On September 16, 2015, the Pulitzer Prize-winning investigative journalism outlet InsideClimate News published the first installment of a seven-part series titled “Exxon: The Road Not Taken.” Based on internal Exxon documents obtained through months of research, the series documented how the company’s own scientists had confirmed climate change in the late 1970s and how the company had subsequently funded denial. Days later, the Los Angeles Times and Columbia University’s Energy and Environment Reporting Project published a parallel investigation reaching similar conclusions. The phrase “Exxon Knew” became a global rallying cry.

Key Claims

• ExxonMobil’s own scientists confirmed that fossil fuel combustion was causing dangerous global warming as early as 1977, and internal climate models accurately predicted warming trajectories decades in advance
• Despite this private knowledge, Exxon and other fossil fuel companies funded a decades-long public campaign to manufacture doubt about climate science
• The Global Climate Coalition — an industry lobby group whose own science advisors acknowledged the greenhouse effect — spent millions fighting climate regulations including the Kyoto Protocol
• Koch Industries, through Charles and David Koch, funded a network of think tanks and advocacy organizations specifically to undermine the scientific consensus on climate change
• The American Petroleum Institute developed internal communications strategies, including a 1998 “Global Climate Science Communications Plan,” that explicitly aimed to create the impression of scientific uncertainty where little existed
• Fossil fuel companies modeled their denial strategy on the tobacco industry’s earlier campaign to manufacture doubt about the link between smoking and cancer
• The combined effect of these campaigns delayed meaningful climate action by decades, with measurable consequences for global emissions and warming
• Industry-funded scientists and spokespeople were presented as independent experts when they were in fact financially linked to fossil fuel interests

Evidence

The documentary evidence for the Exxon Knew narrative is extensive, publicly accessible, and has been subjected to peer-reviewed analysis.

The foundational evidence consists of internal ExxonMobil documents — memos, presentations, and research reports spanning 1977 to 2003. In January 2023, Geoffrey Supran, Stefan Rahmstorf, and Naomi Oreskes published a landmark study in Science that systematically analyzed Exxon’s internal climate projections. They found that 63% to 83% of Exxon’s internal climate models accurately predicted subsequent global warming, with skill and accuracy that “ichieved those of academic and government models.” The study established that Exxon had internal scientific knowledge of climate change that was as good or better than the publicly available science of the time — and chose to publicly deny what it privately knew.

The American Petroleum Institute’s 1998 “Global Climate Science Communications Plan,” leaked to the New York Times in 1998, laid out an explicit strategy. The document stated: “Victory will be achieved when… average citizens ‘understand’ (recognize) uncertainties in climate science.” The plan proposed a $5 million campaign to recruit and fund five “ichieve [independent scientists] who do not have a long history of visibility and/or participation in the climate change debate” to serve as media spokespeople questioning the consensus.

Robert Brulle, a sociologist at Drexel University, published the most comprehensive analysis of climate denial funding in Climatic Change in 2014. Brulle identified 91 organizations involved in climate denial activities and traced their funding to fossil fuel companies, conservative foundations, and — increasingly — anonymous “dark money” channeled through organizations like DonorsTrust and Donors Capital Fund, which obscured the original source of contributions. Brulle found that identifiable climate denial funding averaged $900 million per year between 2003 and 2010.

The Union of Concerned Scientists (UCS) published a 2015 report, “The Climate Deception Dossiers,” containing previously unreleased internal fossil fuel industry documents. These included memos showing that industry scientists understood the climate risks of their products and that industry executives made conscious decisions to fund doubt rather than act on their own research.

The Global Climate Coalition’s own internal 1995 primer — obtained by the New York Times and published in 2009 — stated clearly that the science of global warming “cannot be denied.” The organization continued to publicly promote doubt for another five years before disbanding in 2002.

Multiple state attorneys general have used these documents as the basis for legal action. New York Attorney General Eric Schneiderman launched an investigation into ExxonMobil in 2015; Massachusetts Attorney General Maura Healey followed in 2016. As of 2025, over 40 climate-related lawsuits against fossil fuel companies are pending in U.S. courts.

Cultural Impact

The “Exxon Knew” revelations reshaped the climate debate. Before 2015, the primary narrative was a dispute between climate scientists and “skeptics” — a framing the fossil fuel industry had carefully cultivated. After the InsideClimate News and Los Angeles Times investigations, the narrative shifted to one of deliberate corporate deception. The comparison to Big Tobacco became inescapable: both industries had possessed internal scientific evidence of their products’ harm, both had funded campaigns to manufacture doubt, and both had used identical strategies — emphasizing uncertainty, recruiting credentialed spokespeople, and lobbying against regulation.

The revelations accelerated the divestment movement. Institutional investors managing trillions of dollars — including major pension funds, university endowments, and sovereign wealth funds — began divesting from fossil fuel holdings, citing both financial risk and ethical concerns. The Global Fossil Fuel Divestment Commitments Database tracked over $40 trillion in committed divestment by 2023.

The Exxon Knew case also became a reference point in broader discussions about corporate accountability and the limits of free speech in commercial contexts. Legal scholars debated whether fossil fuel companies’ funding of climate denial constituted protected speech, commercial fraud, or racketeering. The parallels with the tobacco litigation of the 1990s — which ultimately resulted in a $206 billion Master Settlement Agreement — suggested a possible future for climate liability litigation, though the legal landscape remains evolving.

For conspiracy theory research, the case carries a particular significance: it is a confirmed conspiracy that followed the structural template of many alleged conspiracies — powerful actors suppressing inconvenient truth for profit — but with the critical difference of documentary proof. It serves as evidence that corporate conspiracies do occur, while simultaneously demonstrating that they can be exposed through investigative journalism, document leaks, and legal discovery.

Sources & Further Reading

• Supran, Geoffrey, Stefan Rahmstorf, and Naomi Oreskes. “Assessing ExxonMobil’s Global Warming Projections.” Science 379, no. 6628 (2023): eabk0063.
• Oreskes, Naomi, and Erik M. Conway. Merchants of Doubt: How a Handful of Scientists Obscured the Truth on Issues from Tobacco Smoke to Climate Change. New York: Bloomsbury Press, 2010.
• Brulle, Robert J. “Institutionalizing Delay: Foundation Funding and the Creation of U.S. Climate Change Counter-Movement Organizations.” Climatic Change 122 (2014): 681-694.
• Banerjee, Neela, Lisa Song, and David Hasemyer. “Exxon: The Road Not Taken.” InsideClimate News, September 16, 2015 (seven-part series).
• Union of Concerned Scientists. “The Climate Deception Dossiers.” Cambridge, MA: UCS, 2015.
• Mayer, Jane. Dark Money: The Hidden History of the Billionaires Behind the Rise of the Radical Right. New York: Doubleday, 2016.
• American Petroleum Institute. “Global Climate Science Communications Plan.” Leaked internal document, 1998. Published by the New York Times.
• Franta, Benjamin. “Early Oil Industry Knowledge of CO2 and Global Warming.” Nature Climate Change 8 (2018): 1024-1025.