When They Knew: How the Fossil Fuel Industry Buried Its Own Climate Science

The story begins not with climate deniers casting doubt on new science, but with something far more troubling: companies conducting rigorous research, understanding exactly what their products would do to the planet, and then spending decades lying to the public. They treated science as an internal planning tool and then deployed public relations, front groups, and “manufactured doubt” to delay regulation and protect profits.

The Oil Industry’s Own Scientists Saw It Coming

In 1977, a scientist named James Black stood before Exxon’s management committee with an uncomfortable message. According to internal documents later uncovered by investigative journalists, Black told executives that burning fossil fuels was increasing atmospheric carbon dioxide, and that continually rising CO2 levels would increase global temperatures by two to three degrees—a projection that is still consistent with today’s scientific consensus. He warned that we had a window of just five to ten years before “hard decisions regarding changes in energy strategies might become critical”.

What happened next is remarkable for its precision. Throughout the late 1970s and 1980s, Exxon assembled what one scientist called “a credible scientific team” to investigate the climate question. They launched ambitious projects, including outfitting a supertanker with custom instruments to measure how oceans absorbed CO2—one of the most pressing scientific questions of the era. A 2023 Harvard study analyzing Exxon’s internal climate projections from 1977 to 2003 found they predicted global warming with what researchers called “shocking skill and accuracy.” Specifically, the company projected 0.20 degrees Centigrade of warming per decade, with a margin of error of just 0.04 degrees—a forecast that has proven largely correct.

Exxon wasn’t alone. Shell produced a confidential 1988 report titled “The Greenhouse Effect” that warned of climate changes “larger than any that have occurred over the last 12,000 years,” including destructive floods and mass migrations. The report revealed Shell had been running an internal climate science program since 1981. In one striking document from 1986, Shell predicted that fossil fuel emissions would cause changes “the greatest in recorded history”.

Even industry groups understood what was coming. In 1980, the American Petroleum Institute (API) invited Stanford scientist John Laurmann to brief oil company representatives at its secret “CO2 and Climate Task Force”. His presentation, now public, warned that continued fossil fuel use would be “barely noticeable” by 2005 but by the 2060s would have “globally catastrophic effects.” That same year, the API called on governments to triple coal production worldwide, publicly insisting there would be no negative consequences.

The Coal Industry Knew Even Earlier

If anything, the coal industry understood the problem first. A 1966 article in the trade publication Mining Congress Journal by James Garvey, president of Bituminous Coal Research Inc., explicitly discussed how continued coal consumption would increase atmospheric temperatures and cause “vast changes in the climates of the earth.” A combustion engineer from Peabody Coal, now the world’s largest coal company, acknowledged in the same publication that the industry was “buying time” before air pollution regulations would force action.

This 1966 evidence is particularly damning because it predates widespread public awareness by decades. The coal industry didn’t stumble into climate denial—they entered it with full knowledge of what they were obscuring.

Major coal interests also had early awareness that carbon emissions posed regulatory and market risks, particularly for coal‑fired electricity, and they participated in joint industry research and strategy discussions about climate change in the 1980s and 1990s. At the same time, coal associations helped create public campaigns such as the Information Council for the Environment (ICE—even then a disturbing acronym), whose internal planning documents explicitly set an objective to “reposition global warming as theory (not fact)” and to target specific demographic groups with tailored doubt‑based messages.

According to a report from the Union of Concerned Scientists, these efforts often relied on “grassroots” fronts, advertising, and even forged constituent letters to legislators to undermine support for climate policy and to counter the conclusions of mainstream climate science, which even the companies’ own experts did not refute.

What They Said Publicly

The contrast between private knowledge and public statements is stark. While Exxon scientists were building sophisticated climate models internally, the company’s public messaging emphasized uncertainty. In a 1997 speech, Exxon CEO Lee Raymond told an audience at the World Petroleum Conference: “Let’s agree there’s a lot we really don’t know about how climate change will change in the 21st century and beyond”.  They spread messaging that emphasized uncertainty, framed global warming as just a “theory,” and highlighted supposed flaws in climate models, even as their own scientists were using those models to make precise projections. The company and allied trade associations supported think tanks and advocacy groups such as Citizens For Sound Science, that questioned if human activity was responsible for warming and opposed binding limits on emissions, producing a stark discrepancy between internal scientific knowledge and external communication.

In 1989, Exxon helped create the Global Climate Coalition—despite its environmental sounding name, the organization worked to cast doubt on climate science and block clean energy legislation throughout the 1990s. Electric utilities and coal‑linked organizations joined this coalition to systematically attack climate scientists and lobby to weaken or stall international agreements like the Kyoto Protocol, despite internal recognition that greenhouse gases were driving warming.

Internal API documents from a 1998 meeting reveal an explicit strategy to “ensure that a majority of the American public… recognizes that significant uncertainties exist in climate science”.

In 1991, Shell produced a film, “Climate of Concern,” which stated that human driven—as opposed to greenhouse gas driven—climate change was happening “at a rate faster than at any time since the end of the ice age” and warned of extreme weather, flooding, famine, and climate refugees.  They understood the science but tried to shift the blame.

According to a 2013 Drexel University study, between 2003 and 2010 alone, approximately $558 million was distributed to about 100 climate change denial organizations. Greenpeace reports that Exxon alone spent more than $30 million on think tanks promoting climate denial.

The Tobacco Playbook

The parallels to Big Tobacco’s strategy are not coincidental—they’re intentional. Research by the Center for International Environmental Law uncovered more than 100 documents from the Tobacco Industry Archives showing that oil and tobacco companies not only used the same PR firms and research institutes, but often the same individual researchers. The connection goes back to at least the 1950s.  A report published in Scientific American suggests the oil and tobacco industries both hired the PR firm Hill & Knowlton Inc. as early as 1956.

A 1969 internal memo from R.J. Reynolds Tobacco Company stated plainly: “Doubt is our product since it is the best means of competing with the ‘body of fact’ that exists in the mind of the general public”. This became the template. Create uncertainty. Emphasize what isn’t known rather than what is. Fund research that casts doubt. Attack the credibility of independent scientists. They formed organizations with scientific-sounding names that existed primarily to muddy the waters.

In one particularly brazen example, a 2015 presentation by Cloud Peak Energy executive Richard Reavey titled “Survival Is Victory: Lessons From the Tobacco Wars,” explicitly coached coal executives on how to apply tobacco industry tactics.

What makes the fossil fuel case particularly egregious is the temporal dimension. These weren’t companies caught off-guard by emerging science. They funded the research. They understood the findings. Their own scientists urged action. A 1978 Exxon memo noted this could be “the kind of opportunity we are looking for to have Exxon technology, management and leadership resources put into the context of a project aimed at benefitting mankind”.

Instead, when oil prices collapsed in the mid-1980s, Exxon pivoted from conducting climate research to funding climate denial. By the late 1980s, according to reporting by InsideClimate News, Exxon “curtailed its carbon dioxide research” and “worked instead at the forefront of climate denial”.

Where We Stand Now

Across the oil, gas, and coal industries, there is not a genuine scientific dispute inside companies but a divergence between what in‑house experts knew and what corporate leaders chose to communicate to the public and policymakers. This divergence mirrors the tobacco industry’s long‑running use of organized doubt. In both arenas, industry actors treated early recognition of harm as a legal and political threat and responded by investing in campaigns to confuse, delay, and reframe the science rather than addressing the risks their own research had identified.

The evidence trail has led to legal action. More than 20 cities, counties, and states have filed lawsuits against fossil fuel companies for damages caused by climate change, arguing the industry knowingly deceived the public. The European Parliament held hearings in 2019 on climate denial by ExxonMobil and other actors. The hashtags #ExxonKnew, #ShellKnew, and #TotalKnew have become rallying cries for accountability.

Senator Sheldon Whitehouse has explicitly compared the fossil fuel industry’s actions to the tobacco racketeering case that ultimately held cigarette makers accountable. As he noted in a Senate speech, the elements of a civil racketeering case are straightforward: defendants conducted an enterprise with a pattern of racketeering activity.

The difference between the tobacco and fossil fuel cases may be one of scale. As researchers Naomi Oreskes and Erik Conway documented in their book Merchants of Doubt, both industries worked to obscure truth for profit. But while tobacco kills individuals, climate change threatens entire ecosystems and future generations.  The time to act is now.

Sources:

Scientific American – “Exxon Knew about Climate Change Almost 40 Years Ago”
https://www.scientificamerican.com/article/exxon-knew-about-climate-change-almost-40-years-ago/
 
Harvard Gazette – Harvard-led analysis finds ExxonMobil internal research accurately predicted climate change
https://news.harvard.edu/gazette/story/2023/01/harvard-led-analysis-finds-exxonmobil-internal-research-accurately-predicted-climate-change/
 
InsideClimate News – Exxon’s Own Research Confirmed Fossil Fuels’ Role in Global Warming Decades Ago
https://insideclimatenews.org/news/02052024/from-the-archive-exxon-research-global-warming/
 
PBS Frontline – Investigation Finds Exxon Ignored Its Own Early Climate Change Warnings
https://www.pbs.org/wgbh/frontline/article/investigation-finds-exxon-ignored-its-own-early-climate-change-warnings/
 
NPR – Exxon climate predictions were accurate decades ago. Still it sowed doubt
https://www.npr.org/2023/01/12/1148376084/exxon-climate-predictions-were-accurate-decades-ago-still-it-sowed-doubt
 
Science (journal) – Assessing ExxonMobil’s global warming projections
https://www.science.org/doi/10.1126/science.abk0063
 
Climate Investigations Center – Shell Climate Documents
https://climateinvestigations.org/shell-oil-climate-documents/
 
The Conversation – What Big Oil knew about climate change, in its own words
https://theconversation.com/what-big-oil-knew-about-climate-change-in-its-own-words-170642
 
ScienceAlert – The Coal Industry Was Well Aware of Climate Change Predictions Over 50 Years Ago
https://www.sciencealert.com/coal-industry-knew-about-climate-change-in-the-60s-damning-revelations-show
 
The Intercept – A Major Coal Company Went Bust. Its Bankruptcy Filing Shows That It Was Funding Climate Change Denialism
https://theintercept.com/2019/05/16/coal-industry-climate-change-denial-cloud-peak-energy/
 
Center for International Environmental Law – Big Oil Denial Playbook Revealed by New Documents
https://www.ciel.org/news/oil-tobacco-denial-playbook/
 
Wikipedia – Tobacco industry playbook
https://en.wikipedia.org/wiki/Tobacco_industry_playbook
 
Scientific American – Tobacco and Oil Industries Used Same Researchers to Sway Public
https://www.scientificamerican.com/article/tobacco-and-oil-industries-used-same-researchers-to-sway-public1/
 
Environmental Health (journal) – The science of spin: targeted strategies to manufacture doubt with detrimental effects on environmental and public health
https://link.springer.com/article/10.1186/s12940-021-00723-0
 
Senator Sheldon Whitehouse – Time to Wake Up: Climate Denial Recalls Tobacco Racketeering
https://www.whitehouse.senate.gov/news/speeches/time-to-wake-up-climate-denial-recalls-tobacco-racketeering/
 
VICE News – Meet the ‘Merchants of Doubt’ Who Sow Confusion about Tobacco Smoke and Climate Change
https://www.vice.com/en/article/meet-the-merchants-of-doubt-who-sow-confusion-about-tobacco-smoke-and-climate-change/
 
Union of Concerned Scientists – The Climate Deception Dossiers
https://www.ucs.org/sites/default/files/attach/2015/07/The-Climate-Deception-Dossiers.pdf
 
 
Illustration generated by author using ChatGPT.