Between 1977 and 1982, Exxon scientists conducted groundbreaking research on atmospheric CO2 and climate change, producing models that accurately predicted warming trends decades in advance. By 1988, as scientific consensus solidified, the company pivoted to funding a coordinated disinformation campaign. This investigation reconstructs Exxon's dual strategy: pioneering climate science internally while bankrolling the architecture of public doubt.
On an unspecified day in July 1977, James F. Black stood before Exxon's management committee and delivered a presentation that would later be cited as evidence in climate fraud investigations across multiple states. Black, a senior scientist in Exxon's Research and Engineering Division, outlined what the company's research indicated about carbon dioxide accumulation in the atmosphere. His message was unequivocal: burning fossil fuels would increase atmospheric CO2, trap heat, and cause measurable warming within decades.
"Present thinking holds that man has a time window of five to ten years before the need for hard decisions regarding changes in energy strategies might become critical," Black told executives. He warned that a doubling of atmospheric CO2—projected to occur by the mid-21st century—would increase global temperatures by 2 to 3 degrees Celsius and produce "dramatic environmental effects before the year 2050."
Black's presentation was not speculative. It synthesized emerging scientific consensus with Exxon's own preliminary research. In a follow-up briefing in 1978, he provided additional detail on projected impacts, including sea level rise, shifts in agricultural zones, and disruption of ocean currents. The presentations were sufficiently credible that Exxon launched what would become one of the most sophisticated corporate climate research programs of the era.
In 1980, Exxon initiated a multi-year project to measure atmospheric and oceanic CO2 concentrations using one of its own tankers. The Esso Atlantic was outfitted with specialized equipment to collect data during voyages between the Gulf of Mexico and the North Atlantic. The program, managed by researcher Edward Cohen, cost over $1 million annually—a substantial investment reflecting the company's commitment to understanding climate dynamics.
The tanker program collected data that confirmed a critical mechanism: oceans were absorbing significant amounts of atmospheric CO2, but would eventually reach saturation, accelerating atmospheric accumulation. Cohen co-authored peer-reviewed papers presenting these findings in the Journal of Geophysical Research. The work was scientifically rigorous and contributed to the broader field of climate science.
Simultaneously, Exxon researchers developed internal climate models. In 1982, scientist Henry Shaw authored a report projecting that atmospheric CO2 would reach 400-420 parts per million by 2010 and that global average temperatures would rise 1 to 3 degrees Celsius by 2050, depending on emissions scenarios. These projections were not public; they were circulated internally for strategic planning.
The accuracy of Exxon's early models is now well-documented. In 2023, researchers Geoffrey Supran, Stefan Rahmstorf, and Naomi Oreskes published a study in Science analyzing the company's climate projections from 1977 to 2003. They found that Exxon's models were consistent with subsequent observations and contradicted the company's later public statements of scientific uncertainty. The study concluded: "ExxonMobil's own data contradicted its public claims."
By 1982, Exxon had accumulated substantial internal evidence confirming anthropogenic climate change. The company's research program was producing peer-reviewed publications. Its models were tracking emerging data. Then, abruptly, the program was discontinued.
In 1983, Exxon disbanded its climate modeling group. The tanker CO2 sampling program ended. Researchers were reassigned. Publicly, the company stated it was shifting focus to other research priorities. Internal documents reviewed decades later suggest the shutdown was strategic: climate change posed an existential threat to the fossil fuel business model, and continued research would only generate evidence that might support regulation.
"The case for global warming is far from clear. The earth is cooler today than it was twenty years ago."
Lee Raymond, ExxonMobil CEO — Speech in Beijing, 1997What followed was a coordinated effort to reposition climate science as uncertain. In 1989, Exxon joined the founding membership of the Global Climate Coalition (GCC)—a lobbying group formed by fossil fuel companies and trade associations to oppose binding greenhouse gas reductions. The GCC spent millions on advertising and public relations emphasizing scientific doubt, even as internal briefings confirmed the science was sound.
A 1995 scientific advisory panel informed GCC leadership: "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." Despite this internal acknowledgment, the coalition continued distributing materials stating climate science was "not settled."
Between 1989 and 2002, Exxon spent approximately $30 million funding organizations that questioned climate science or opposed climate regulation. Recipients included think tanks, advocacy groups, and research institutions that produced reports, op-eds, and testimony emphasizing uncertainty about warming, its causes, or its impacts.
This strategy was not invented by the fossil fuel industry. Naomi Oreskes, a science historian at Harvard, documented in her book Merchants of Doubt (2010) that the playbook was adapted from the tobacco industry's response to evidence linking smoking to cancer. The approach: fund scientists willing to question consensus, emphasize uncertainty in media coverage, and argue that policy action would be premature given "unresolved" scientific questions.
The American Petroleum Institute coordinated much of this effort. A 1998 internal memo outlined a communications strategy to "reposition global warming as theory rather than fact" and ensure "recognition of uncertainties becomes part of the conventional wisdom." The memo identified target audiences—journalists, policymakers, and the public—and outlined tactics for influencing media coverage and policy debates.
Exxon's CEO during much of this period was Lee Raymond, who led the company from 1993 to 2005. Raymond became the most prominent corporate voice questioning climate science. In a 1997 speech in Beijing, he stated: "The case for global warming is far from clear. The earth is cooler today than it was twenty years ago." This claim was factually incorrect even at the time, contradicted by NASA and NOAA temperature records—and by Exxon's own internal models.
The gap between Exxon's internal knowledge and public communications became quantifiable evidence only after investigative journalists obtained internal documents. In September 2015, InsideClimate News published an eight-month investigation based on company records spanning four decades. Reporters Neela Banerjee, Lisa Song, and David Hasemyer documented the James Black briefings, the tanker program, and the subsequent strategic pivot. The Los Angeles Times published a parallel investigation in October 2015, independently corroborating the findings.
The investigations revealed internal planning documents showing Exxon used climate projections to assess risks to Arctic drilling operations—factoring warming into engineering decisions—while simultaneously funding organizations that questioned whether warming was occurring. This dual use of science—reliable for internal planning, uncertain for public consumption—formed the basis for subsequent fraud allegations.
In 2017, Geoffrey Supran and Naomi Oreskes published a content analysis in Environmental Research Letters examining 187 Exxon climate communications from 1977 to 2014. They coded each document for whether it acknowledged anthropogenic global warming (AGW), expressed doubt, or remained neutral. The results quantified the discrepancy: 83% of peer-reviewed papers and 80% of internal documents acknowledged climate change as real and human-caused, while 81% of advertorials—paid opinion pieces published in outlets like the New York Times—expressed doubt.
The study's significance was methodological. It transformed what had been narrative evidence—"Exxon knew and lied"—into statistical proof of systematic divergence between scientific and public communications.
In November 2015, New York Attorney General Eric Schneiderman issued a subpoena to ExxonMobil seeking decades of internal documents related to climate research and communications. The investigation examined whether the company violated state consumer protection and securities laws by misleading investors and the public about climate risks. Attorneys general in Massachusetts, California, and other states joined the inquiry.
The legal theory was straightforward: if Exxon knew climate change posed material risks to its business model—stranded assets, regulatory costs, liability exposure—and failed to disclose those risks to shareholders, it committed securities fraud. If the company publicly denied climate science while internally relying on it, it engaged in consumer deception.
ExxonMobil challenged the investigations on First Amendment grounds, arguing that questioning scientific consensus was protected speech. The company also argued state AGs lacked jurisdiction over statements made nationally. These procedural battles delayed substantive litigation for years.
Parallel litigation emerged from cities and states seeking damages for climate adaptation costs. Cases filed by New York City, San Francisco, Baltimore, and others alleged that fossil fuel companies, including Exxon, knowingly contributed to climate change and should bear costs of sea walls, infrastructure upgrades, and disaster response. These cases cited the InsideClimate News investigations and the Supran-Oreskes content analysis as evidence of knowledge and deception.
Rex Tillerson, who served as ExxonMobil CEO from 2006 to 2016 before becoming U.S. Secretary of State, became a focal point in investigations when it was revealed he used a pseudonym email account—"Wayne Tracker"—for climate-related communications. The practice, disclosed during discovery proceedings, hindered investigators' ability to obtain relevant documents and raised questions about deliberate concealment.
Tillerson testified before Congress in 2019 in connection with climate investigations. He stated he was "not aware" of any internal suppression of climate research and characterized differences between internal models and public statements as normal business communications. His testimony was contradicted by documents showing he received briefings on climate risks while publicly minimizing their significance.
Under Tillerson's leadership, Exxon's public stance evolved from explicit denial to cautious acknowledgment—the company began stating that climate change was real and required a policy response, but argued that response should be market-based and gradual. Critics characterized this as strategic adaptation: acknowledging science once denial became untenable, while continuing to oppose substantive regulation.
By the 2010s, institutional investors began pressing Exxon for climate risk disclosure. Pension funds, asset managers, and religious investment groups filed shareholder resolutions requesting scenario analysis showing how the company's business model would perform under various climate policy outcomes—particularly scenarios consistent with limiting warming to 2 degrees Celsius, as outlined in the Paris Agreement.
These resolutions framed climate not as an environmental issue but as a fiduciary one. If climate regulation made fossil fuel reserves unburnable, those assets would lose value—"stranded assets" that represented material financial risk. Failure to disclose this risk, investors argued, violated securities law and management's duty to shareholders.
In 2017, one such resolution received 62% support—a rare majority vote against management recommendations. The result signaled that mainstream investors viewed climate risk disclosure as material to financial decision-making. Exxon subsequently published limited climate risk assessments, though critics argued the reports systematically understated risks by assuming minimal policy action.
The documented record establishes several facts:
First, Exxon possessed accurate climate science by the late 1970s, conducted by its own researchers and validated through multi-year empirical programs. This science was not preliminary or speculative—it was peer-reviewed, quantitative, and predictive.
Second, the company used this science for internal planning, factoring climate projections into engineering decisions for Arctic operations and long-term strategic assessments. This demonstrates the company treated the science as reliable when making capital allocation decisions.
Third, beginning in the late 1980s, Exxon funded organizations and communications campaigns that questioned the same science the company relied on internally. This divergence was systematic, spanning decades and involving tens of millions of dollars in funding.
Fourth, company executives made public statements minimizing climate risks that were contradicted by internal documents and models. These statements influenced public perception, policy debates, and investor decisions.
"ExxonMobil's own data contradicted its public claims. The company knew, and it knew accurately."
Geoffrey Supran et al. — Science, 2023What remains contested is intent and legal liability. Exxon argues it engaged in legitimate policy advocacy, that emphasizing scientific uncertainty was reasonable given evolving knowledge, and that state investigations constitute politically motivated attacks on corporate speech. Prosecutors argue the company knowingly deceived investors and the public for competitive advantage, suppressing action that would have required costly changes to its business model.
The case has become a defining example of corporate knowledge versus public responsibility. Unlike cases involving negligence or unforeseen consequences, the Exxon record documents a company that understood the problem, modeled its trajectory, and chose a strategy of public doubt over disclosure.
As of 2024, litigation continues. Multiple states have active investigations or filed cases. Discovery has produced thousands of internal documents. Exxon has spent hundreds of millions defending against these actions, employing procedural challenges to delay substantive trials. No criminal charges have been filed—corporate climate deception does not fit neatly into existing criminal statutes—but civil liability remains a realistic outcome.
The company now publicly acknowledges climate change and supports limited policy measures, including carbon pricing that would spread costs broadly rather than holding producers liable. Whether this represents genuine strategic evolution or continued delay depends on one's interpretation of the evidence.
What is not disputed is the paper trail: scientists warning executives in 1977, models projecting warming in 1982, research programs disbanded in 1983, denial funding beginning in 1989, and public statements contradicting internal knowledge through the 2000s. The architecture of knowing and denying is documented—the legal and moral consequences remain unresolved.