A major new report from the US National Academies of Sciences, Engineering, and Medicine has declared that climate attribution science—the ability to link specific extreme weather events to climate change—has matured to the point where it can provide robust, confident answers. The report, released Thursday, is being hailed by scientists and advocates as a turning point, but it has also ignited a furious backlash from the fossil fuel industry and its political allies, who see it as a direct threat to their bottom line.

The report finds that attribution science can now determine with high confidence how much climate change increased the likelihood or intensity of heatwaves, heavy rainfall, and droughts. This marks a significant leap from just a decade ago, when such analyses were far more uncertain. The National Academies, the nation's most prestigious scientific advisory body, based its conclusions on a thorough review of peer-reviewed studies and methodological advances.

What Is Attribution Science?

Attribution science works by comparing the probability of an extreme event in today's climate—with its elevated greenhouse gas levels—against a counterfactual world without human-caused climate change. By running thousands of climate model simulations, scientists can quantify the 'fraction of attributable risk.' For example, a study might find that a particular heatwave was made 10 times more likely due to climate change.

The Union of Concerned Scientists (UCS), which has been tracking the development of attribution science for years, explains that these methods are now standard practice. 'Attribution science is no longer experimental; it's a mature field that can provide actionable information,' said a UCS scientist.

Legal Implications: A 'Dagger' for Oil Companies

The report has immediate legal ramifications. Several states and municipalities have filed lawsuits against major oil companies, seeking billions of dollars in damages for climate-related harms such as sea-level rise, wildfires, and extreme heat. The National Academies report provides a scientific stamp of approval for using attribution evidence in court.

According to E&E News, the report 'adds fuel to billion-dollar legal fights.' In one high-profile case, the state of California is suing ExxonMobil, Chevron, and other companies, alleging they knew about climate risks for decades but deceived the public. A recent lawsuit filed in Oregon seeks damages for the death of a woman during the 2021 heat dome, directly citing attribution science.

Phys.org reports that the new science 'could boost climate damage suits against oil giants.' The report's imprimatur from the National Academies makes it harder for defendants to dismiss attribution evidence as 'junk science.'

Political Firestorm: Republicans and Big Oil Fight Back

The fossil fuel industry and its political allies have not taken this lying down. Multiple sources, including Politico and E&E News, detail a coordinated campaign to discredit the report and undermine the National Academies. Republican lawmakers in Congress have threatened to cut funding to the Academies, and some have launched investigations into the report's authors.

'Have politics finally come for the National Academies of Science?' asked Ars Technica in a headline. The outlet notes that the Academies have long been seen as above the political fray, but the climate attribution report has made them a target.

According to a report in The Guardian, Republican lawmakers have introduced bills that would shield oil companies from climate liability lawsuits. One bill, the 'Energy Choice Act,' would bar states from using federal climate science in state court cases. 'These bills are alarming and represent an unprecedented attempt to immunize the fossil fuel industry from accountability,' said a legal expert quoted by The Guardian.

Inside Climate News reports that the Trump administration and Republican allies have joined Big Oil's 'all-out push to shut down climate liability efforts.' The administration has also attempted to eliminate carbon emissions reporting requirements, a move that the UCS says 'could backfire' by undermining transparency.

Historical Context: Decades of Deceit

The current legal battles are rooted in a long history of alleged deception. The UCS has compiled a 'Decades of Deceit' timeline showing that ExxonMobil and other companies conducted cutting-edge climate research as early as the 1970s, but then spent millions on disinformation campaigns to sow doubt about climate science.

Congressional investigations have uncovered internal documents showing that oil companies knew their products were causing dangerous warming. 'Big Oil has been lying to us for decades,' the UCS states. 'Don't let it off the hook.'

In a 2025 development, Congress released new evidence of Big Oil climate disinformation, including emails and internal memos. The House Oversight Committee held hearings where executives from ExxonMobil, Chevron, and Shell were grilled about their knowledge and actions.

Expert Views: A Growing Consensus

Scientists and legal experts are largely united in their assessment. 'The National Academies report is a game-changer,' said Dr. Michael Mann, a climate scientist at the University of Pennsylvania. 'It provides the scientific foundation for attribution that courts have been waiting for.'

However, some caution that challenges remain. 'Attribution science can tell us that climate change made an event more likely, but it cannot always pinpoint the exact contribution of a single company,' noted a legal scholar. 'That requires additional evidence about emissions and deception.'

Industry representatives have pushed back. A spokesperson for the American Petroleum Institute said, 'Climate change is a global challenge that requires global solutions, not lawsuits that target American energy companies. The National Academies report does not change the fact that these lawsuits are meritless.'

Data Points and Implications

The stakes are enormous. The total value of climate-related lawsuits against oil companies now exceeds $1 trillion, according to a report by Zero Carbon Analytics. These include suits by states, cities, and private individuals. A win for plaintiffs could set a precedent that forces companies to pay for adaptation and mitigation costs.

Investors are also taking notice. Shareholder resolutions at ExxonMobil and Chevron have demanded greater transparency on climate risk. The UCS reports that 'investors move fight over fossil fuel dangers from the boardroom to the courtroom.'

The report also has implications for insurance, building codes, and disaster preparedness. If attribution science can reliably link extreme events to climate change, it could reshape how risks are priced and managed.

Looking Ahead: COP30 and Beyond

As the world prepares for COP30 in Brazil, the report adds urgency to international climate negotiations. The UCS has called for a COP 'free from fossil fuel industry influence,' pointing to the industry's history of co-opting climate talks.

Meanwhile, the political battle over climate accountability is likely to intensify. With Republicans controlling Congress and the White House, efforts to shield oil companies from lawsuits may accelerate. But the National Academies report provides a powerful counterweight, grounding the debate in solid science.

As one scientist put it, 'You can't legislate away the laws of physics. The science is clear, and it's not going away.'