BP shaped – Nearly 3,000 citations and a generation of climate teaching later, Princeton’s “Wedges” framework still sits at the center of how many people picture solving global warming. But the reporting at the heart of this story traces the paper’s rise to a long, carefu
On a sunny spring day in 1997. John Browne walked up to the podium at Stanford University’s Frost Amphitheater and told his audience that the world had moved past denial. “There is now an effective consensus … that there is a discernible human influence on the climate. ” BP’s chief executive said—then laid out what BP would do next.
He urged action, but warned governments against “crash[ing] into the realities of economic growth.” BP, Browne said, would start with “low-hanging fruit” and would experiment with capturing carbon to keep fossil fuel emissions from reaching the atmosphere.
That speech marked the beginning of a pivot that would echo for decades—right through the language of a landmark climate paper published weeks later in 2004 and promoted far beyond academia. It would also place carbon capture and storage. a technology BP had reason to bet on. into the center of a narrative that would teach millions to believe climate solutions were already within reach.
The paper was called “Wedges. ” written by Princeton University researchers Robert Socolow and Stephen Pacala and published in Science 22 years ago. It became a phenomenon: Al Gore highlighted it in his Oscar-winning climate change documentary “An Inconvenient Truth.” From George W. Bush to Joe Biden, U.S. presidents incorporated ideas from it into policy. The United Nations’ panel on climate change used it in at least three major reports over more than a decade. It was used in classrooms at Harvard and MIT. cited more than 3. 000 times in scientific papers. and even turned into a board game.
For a generation, the “Wedges” paper trained people to think climate action could be stacked from many pieces—renewable energy, nuclear power and conservation, but also a suite of steps that kept oil, gas and coal in the system while promising carbon would be captured and stored underground.
The force behind the paper’s reach wasn’t just scientific—it was corporate strategy.
In 1997, BP abandoned climate change denial, and then quietly built an effort to intertwine its interests with climate research. It sought out researchers already thinking about how to address climate change without replacing fossil fuels. Princeton became a key target. BP donated $15 million to start the Carbon Mitigation Initiative. a research program framed around solutions that would keep fossil fuels in play. with carbon capture heavily emphasized.
The “Wedges” paper was the initiative’s first major swing. And, according to an investigation by ProPublica and Drilled, BP executives and advisers were deeply involved throughout the paper’s creation—so involved that the usual academic boundary between sponsor and scholarship blurred.
Socolow and Pacala. the authors and co-directors of the new center. discussed ideas with the company and. in a departure from academic norms. passed drafts back and forth while welcoming extensive feedback. A BP executive suggested they punch up the language, and Browne himself suggested wording that became part of the title. BP even tried—and failed—to revise a version of the paper.
“Chaps, I have had a go at rewriting the paper,” Browne’s climate adviser wrote to the researchers at one point.
While “Wedges” was being prepared for publication, BP began aggressively promoting the ideas it contained. Browne touted the framework in a speech as evidence that oil and gas had “sustainable futures. ” and published an endorsement in an essay in Foreign Affairs magazine. BP also inserted the paper’s ideas into its sustainability reports. pushing greater efficiency and natural gas as a low-carbon alternative to coal.
BP kept pouring more money into Princeton each year. Internal documents described the goal of using the university’s work to help turn carbon capture and storage into a government-backed solution.
Gardiner Hill. a former vice president and climate executive at BP who worked with the Princeton program. told ProPublica and Drilled that BP took academic freedom seriously and did not oversee any publications under Princeton’s sponsorship. A BP spokesperson declined to respond to two lists of questions sent by ProPublica and Drilled.
Socolow and Pacala told the same outlets they were sincere about solving climate change in the best way they believed possible at a time when it wasn’t obvious that wind and solar would succeed the way they have today. They said BP had no control over the scientific content of the paper and that they rejected the view that technologies didn’t exist to start solving climate change immediately. Pacala, in particular, emphasized carbon capture as a path to make fossil fuels “climate safe.”.
But the reporting found that “Wedges” oversold the readiness of carbon capture and storage. It described the technology as “already deployed” at industrial scale—an assertion that critics say stretched the facts. Even today. the technology faces financial and technical hurdles. and is unlikely to work at the scale needed to avert extreme warming.
“An unfortunate consequence” of the “Wedges” paper, wrote climate scientist Ken Caldeira, New York University physics professor Marty Hoffert, and others in a 2013 critique titled “Rethinking Wedges,” was to make the solution seem easy.
There was a second problem critics pointed to: while carbon capture and other industry-friendly strategies drew robust attention and funding, other approaches that could have replaced carbon-heavy energy—reducing warming and potentially saving lives—were crowded out.
Zeke Hausfather, a climate scientist with the research nonprofit Berkeley Earth, argued that with so much time lost, meeting warming limits has become “functionally impossible.”
The story of how “Wedges” became credible enough to spread so widely runs back to an earlier meeting—one steeped in the language of both science and corporate messaging.
In 1998. as oil companies were already investing in university climate work. the American Petroleum Institute set up what it called its Global Climate Science Communications Plan in 1998. The plan centered on “establishing cooperative relationships” with “scientists whose research in this field supports our position” and on developing “opportunities to maximize the impact of scientific views consistent with ours.”.
In 1999, Browne asked his chief scientist, Bernie Bulkin, to find research programs BP could support in the U.S. Bulkin said he had never heard of the API initiative. He focused on climate programs that could test carbon capture and storage.
The technology had a conceptual bridge to a practice that oil companies already understood: for decades. carbon dioxide had been extracted and pumped underground to force more oil out under pressure. called enhanced oil recovery. If adapted to store carbon forever. proponents argued. it could remove billions of tons of carbon emissions without cutting fossil fuel use.
Socolow had been leading an interdisciplinary environmental program at Princeton since 1971 and. in 1997. ran a summer workshop for the U.S. Department of Energy in which he and others suggested hydrogen could be produced from fuels like natural gas and coal—if carbon emissions from the process could be captured and stored away.
Bulkin evaluated top universities and. he wrote in a 2019 memoir. built a selection process he described as “determinedly elitist” and aimed at getting “the greatest benefit to the company.” He said MIT and Stanford leaned differently in technical focus. but added Princeton because Socolow could synthesize energy challenges and Pacala understood how carbon moves across the atmosphere. land and oceans.
BP would commit roughly $15 million over 10 years to form the Carbon Mitigation Initiative. Pacala helped secure another $5 million from Ford Motor Co., bringing the total to $20 million. When it was announced in October 2000, Princeton said it amounted to the largest corporate grant in its history.
Princeton also described limits meant to protect researchers’ independence: a spokesperson told ProPublica and Drilled that corporate partnerships make up just over 3% of the university’s research funding but help address “real-world problems. ” and that Princeton maintains policies that prevent sponsors from exercising undue influence. including not permitting sponsors to have veto power over publications.
Pacala said the contract with BP was supposed to protect academic independence—that BP “can’t tell us what to do.” Yet the cooperation was described as eager on both sides. In late 2000. Princeton researchers. BP officials and Ford representatives gathered at the president’s residence and spent about two days talking about what would be useful. Together. they shaped an ambitious vision—described in a memo as a “world-class” program. a “place of influence. ” focused on earth science and carbon capture through “a new kind of engagement. ” and intended to help shape government research priorities.
The “Wedges” paper grew out of that relationship and, by the early 2000s, into something broader than a journal article.
In January 2003, BP executives traveled to Princeton for the center’s second annual meeting. The initiative had technical progress to show, but Pacala and Socolow pivoted quickly to a new framework: a way to bring CO2 emissions under control immediately using methods they believed already existed.
The stakes were clear to them. Climate progress. in their telling. was stuck—political support eroded by denial. and modeling suggested fixes might be too expensive until the end of the century. The U.S. had pulled out of the Kyoto treaty in 2001. Bush’s administration focused on expanding basic research into low-carbon energy technologies. signaling to Pacala and Socolow that leaders thought tools to address the crisis were lacking.
Their approach stacked multiple strategies—cars that get 60 mpg. expanding wind and solar. regrowing forests. developing hydrogen-based fuels—so each could “offset a billion tons of CO2 each year by the middle of the century.” Carbon capture sat at the center. meant to remove pollution and allow other approaches reliant on fossil fuels to work.
But critics then and now point out that carbon capture and storage had barely been tested and no experts interviewed could recall a commercial power plant using it.
Still, the story moved forward. Pacala presented the chart directly to Browne in Westminster in late 2003. Browne listened. and Pacala recalls the chief executive responding with confusion: “They’re kind of wedges. aren’t they?” From there. Socolow and Pacala became committed to the framework. They wrote a BP-titled white paper and then refined and revised the Science submission with continued BP involvement.
At one point, Mottershead offered “scathing criticism,” pushing for a “punchy” and “non-academic” tone for broader appeal. Pacala described rewriting the draft from scratch and sending it back four hours later. Mottershead loved it and asked about co-branding the “wedges paper. ” and later tried again—changing terms. pushing for an open-ended timeframe. seeking calculation checks.
Mottershead also edited drafts in ways that survivors of the process say crossed norms. Records show that he suggested language that raised doubt about the legitimacy of basic climate science. describing it as “provisional” and adding that “great uncertainties remain.” Pacala said Mottershead did not convince them to adopt that specific text. Yet the edits that remained included wording that framed emissions against economic growth and moving a punchy line up to the top of the paper.
In early May 2004, Socolow and Pacala submitted the paper to Science. It included 15 wedges. with three involving carbon capture and eight involving traditional fossil fuels in more efficient or less polluting forms. The paper described those wedges as “already deployed at an industrial scale.” In an admission that sits uneasily beside that claim. Pacala said the description was a “communications compromise” and said the components required for carbon capture and storage were in use. but needed to be combined in a new way.
The paper also built on a key assumption about how much carbon pollution the atmosphere could absorb while still avoiding disastrous warming—a number Mottershead supported in ways that kept fossil fuels “part of things for at least another 50 years.”
Once “Wedges” landed in Science, its message took off.
In 2006, Al Gore’s “An Inconvenient Truth” exposed millions of viewers to the danger of fossil fuel use. Toward the end. Gore shifted to optimism and said Americans “already know everything we need to know to effectively address this problem.” Behind him. the opening words of the “Wedges” paper appeared on a screen.
The media loved the framing. Headline language at publication time described “fifteen easy steps” and “ways to stop global warming,” turning a technical framework into a public slogan.
Socolow gave dozens of interviews. spoke at institutions including the American Petroleum Institute. Lehman Brothers and the United Nations Conference of the Parties where representatives from more than 190 countries coordinate international climate action. When the Bush administration released a major climate technology strategy document in 2006, it highlighted the “Wedges” framework. Socolow recalled an administration official saying, “I get it, we don’t need pie in the sky.”.
The influence widened quickly: in 2006. Pacala and Socolow wrote a popular article about it for Scientific American; BP took out a full-page ad. In 2007, Princeton released a “Wedges” game online that Pacala built a prototype for from planks of wood in his garage. High school students, business leaders and policymakers played it.
Even skeptics of BP’s role in the science acknowledged the paper’s appeal. Academics told ProPublica and Drilled that if a BP executive’s name had been on the top of “Wedges,” its message would likely have drawn more skepticism.
Craig Callender, a philosophy professor at the University of California San Diego, asked whether Gore would have used it if he knew. A spokesperson for Gore distanced him from Socolow and Pacala’s work but did not directly address whether knowledge of BP’s involvement would have changed his opinion.
Socolow and Pacala argued that broader disclosure of BP’s partnership would have made the paper more credible, not less.
The “Wedges” story also moved into U.S. institutions. In 2007. Socolow was offered a seat on a National Research Council committee on climate policy and testified before the Senate Finance Committee. In that hearing. he touted a BP carbon capture and storage pilot project as evidence that the technology was “commercially mature. ” and argued the U.S. should offer tax credits for coal power only if those plants used carbon capture technology. A year later, Congress inserted a carbon capture subsidy into the tax code—without requiring coal plants to adopt it.
Pacala was selected as chair of National Academies committees focusing on emissions monitoring and on carbon dioxide removal. In 2021. President Joe Biden appointed him to serve on the Council of Advisors on Science and Technology. and a White House press release cited the “Wedges” paper as Pacala’s standout accomplishment.
Meanwhile, BP’s investment paid off in ways both tangible and strategic.
BP’s investment helped drive strategy inside the company, according to a 2014 internal memo. After “Wedges. ” BP said it would double down on carbon capture and storage demonstration projects and planned to spend $8 billion over 10 years on four other “wedge” strategies—solar. wind. hydrogen and natural gas. The company had nearly $240 billion in oil-and-gas-related revenues in 2005 alone.
As BP’s original commitment neared its end, Princeton and the company worked out a deal to keep support going. A 2007 funding document stated that the goal included helping grow political and regulatory support for carbon capture. using Princeton’s reputation to advance BP’s policy interests. Pacala and Socolow wrote to BP that the “world-class” institution would have a “major role” as “relatively unbiased” public-facing research.
Later funding renewals made the alignment even more explicit. When the university and BP revisited their relationship for a 2016-2020 renewal. the parties made it clear that a premise from the outset was that the Carbon Mitigation Initiative’s job was to invent a future where fossil fuel industries “have not disappeared. ” saying: “This is still our job.”.
BP extended its funding for Princeton’s Carbon Mitigation Initiative three times—originally slated to sunset in 2010, renewed through 2015, through 2020, and finally until 2025. All told, BP gave Princeton more than $56 million.
Still, critics say the “success” has costs.
Caldeira told ProPublica and Drilled that “Wedges” missed its target. that far more carbon needed dealing with than the paper acknowledged. and that the technologies focused on had severe deficiencies. Hoffert said “Wedges” served a purpose because people need hope. but if that hope lets society continue without getting rid of fossil fuels. “you’re gonna be driving the car over a cliff.”.
Even as “Wedges” spread through academia and policy, its reach created an enduring framework for what people considered solvable, and how soon.
According to Geoffrey Supran’s analysis at the University of Miami, roughly 3,000 peer-reviewed papers citing “Wedges” have themselves been cited over 210,000 times—showing the ripple effect of a single framework built to be easy to understand.
Zeke Hausfather’s warning about wasted time lands hard against that history. When the system continues to rely on ways to bury emissions rather than prevent them. time becomes the most expensive resource. By the time the public learned “Wedges,” the question now turns on what it taught—and what it left out.
The reporting ultimately frames “Wedges” not just as an influential scientific paper, but as one shaped by the support and messaging needs of one of the world’s most climate-compromised companies, with a deep financial stake in how carbon capture and storage would be understood, funded, and pursued.
And now, with carbon capture still struggling to meet the scale implied by “Wedges,” the tension that never quite left the story returns to the surface: how much hope was built on a technology that wasn’t ready—and how many policies followed a narrative designed to keep fossil fuels in the picture.
BP Princeton University Wedges carbon capture and storage climate policy Science journal John Browne Al Gore United States politics Senate Finance Committee Kyoto treaty climate change