ScienceNot yet confirmed elsewhere1 publisher2 min readPublished
Santer-led review says the case for human-caused warming has strengthened since 2009
Benjamin Santer's team argues more than 30 years of fingerprint research make the human-warming case stronger than in 2009. Their Earth's Future review answers a July 2025 Department of Energy report that questioned the science behind the EPA's Endangerment Finding.
The Scientist · Science desk
Key figures: the authors say the post-2009 period included the 10 warmest years in instrumental records; they say the DOE report misses 17 years of scientific advances and the weight of 2009 evidence; Santer has worked on climate fingerprints for more than 30 years.
| Figure | Value | Note | Claim |
|---|---|---|---|
| Warmest years on record since 2009, authors say | 10 years | 3 | |
| Years of scientific advances DOE misses, authors say | 17 years | Plus the weight of evidence in 2009 | 17 |
| Santer's fingerprint work | 30 years, over | 8 |
What happened
- The authors say the Department of Energy report ignores both the weight of evidence available in 2009 and the scientific advances of the past 17 years, and they call it deeply flawed.
- Fingerprinting uses the patterns and timing of climate changes to tell human influence from natural influence, and the review traces how those studies developed.
- The review concentrates on annual, decadal and seasonal changes in climate and touches only briefly on the evidence for human influence on extreme events.
- The 2009 Endangerment Finding is the legal determination that greenhouse gas emissions endanger public health in the United States.
Why it matters
- constraint The review is a defence of the field by a researcher inside it. Santer has spent more than 30 years on fingerprint studies, so the history the review traces includes his own early work, and a reader weighing it against the DOE report has to allow for that.
- exposure The dispute may reach past greenhouse gas rules. According to the account, one concern is that rescinding the finding could open the door to ending other U.S. environmental regulations.
- cost Santer puts the research itself at risk, saying "the continuation of rigorous attribution science is endangered." Fewer new fingerprint studies would thin the same evidence base his review says has strengthened the case.
Santer's summary is blunt. "The climate science that's been published since the 2009 Endangerment Finding is now stronger than in 2009; the evidence is incontrovertible," he said [14]. The word "stronger" folds two things together. Fingerprinting techniques have evolved to the point where human influence can be identified throughout the climate system [11]. The planet has also kept warming. The authors note that the post-2009 period includes the 10 warmest years in the instrumental surface temperature record, and they say that raises the human signal relative to the "noise" of natural variability [3]. The account does not say how much of the gain comes from better methods and how much from a larger signal.
The review makes two claims that can fail separately. One is that the science behind the 2009 finding was already compelling; the other is that the case has grown since [13]. The first has a paper trail. The IPCC concluded in 1995 that "the balance of evidence suggests a discernible human influence on global climate," a conclusion Santer's early research contributed to [5]. The EPA made its finding 14 years later [12].
Susan Solomon, a professor of environmental studies at MIT, put the weight on the number of groups involved. "Many rigorous fingerprint studies by multiple research groups worldwide have enhanced confidence in the reality and seriousness of human-caused climate change," she said [15]. In our view, Solomon's point about multiple groups is the stronger answer to the concern about a lead author reviewing his own field, though how independent those groups are cannot be checked until the studies are listed.
Santer also tied the findings to policy. The evidence, he said, "reinforces the need for policies aimed at limiting greenhouse gas emissions and addressing climate-related risks" [10]. Attribution shows what is driving the change. Santer's call on how much to cut, and how fast, is a separate judgement from the science. The same goes for the DOE report: the only description of it in this account comes from the review's authors [16].
What to watch
- Whether the Department of Energy or the EPA answers the review's claim that the 2009 evidence was already compelling.
- The list of studies behind the review, which would show how many independent research groups its conclusion rests on.
- The outcome of the move to revoke the Endangerment Finding, and whether other U.S. environmental regulations are then reopened.
Clarity's read
What the record supports and how the coverage leans. The claims behind it follow.
Reality
- Evidence58
- Adoption
- Insufficient
- Hype gap+12
- Incentives55
- Confidence55
Claim ledger
Ranked by verification strength, evidence, and original report placement.
- [1]
The review was published in Earth's Future and led by professor Benjamin Santer at the University of East Anglia; colleagues are from UEA, MIT, Colorado State University and the University of Edinburgh.
- [2]
Climate fingerprinting uses the patterns and timing of climate changes to distinguish between human and natural influences on Earth's climate, and the review traces the history of such studies.
- [3]
The post-2009 period included the 10 warmest years in instrumental surface temperature records, enhancing the signal of human-caused warming relative to the 'noise' of natural variability.
- [4]
The review focused on fingerprint studies dealing with annual, decadal and seasonal changes in climate, and touched on the body of evidence on the impact of human-caused climate change on the properties of extreme events.
- [5]
Santer's early research contributed to the 1995 Intergovernmental Panel on Climate Change conclusion that 'the balance of evidence suggests a discernible human influence on global climate.'
- [6]
The move to revoke the Endangerment Finding has prompted concerns about the impact on human health and on efforts to reduce greenhouse gas emissions; a further concern is that rescinding it could open the door to ending other environmental regulations in the U.S.
- [7]
The EPA's 2009 Endangerment Finding is the legal determination that greenhouse gas emissions endanger public health in the U.S.
- [8]
Over more than 30 years, Santer has collaborated with colleagues around the world to identify human fingerprints in many different aspects of the climate system.
- [9]
"A different kind of 'Endangerment Finding' is that the continuation of rigorous attribution science is endangered," Santer said.
- [10]
Santer said: "Our review suggests that the growing body of evidence linking human activity to observed climate changes reinforces the need for policies aimed at limiting greenhouse gas emissions and addressing climate-related risks."
- [11]
The authors say fingerprinting techniques have evolved to the point where human influence can now be identified throughout Earth's climate system.
- [12]
The EPA's Endangerment Finding came 14 years after the IPCC's 1995 fingerprint-based conclusion.
- [13]
The review argues that more than three decades of climate fingerprint research provide overwhelming evidence that greenhouse gas emissions are driving changes throughout the climate system, and that the scientific basis for the EPA's 2009 Endangerment Finding was already compelling in 2009 and has become stronger since.
ReportedContestedSource: Santer and colleagues, Earth's Future review, as summarised by phys.org2 sources— create a free account to open themView cited source - [14]
"The climate science that's been published since the 2009 Endangerment Finding is now stronger than in 2009; the evidence is incontrovertible," said Santer, of UEA's School of Environmental Sciences.
ReportedContestedSource: Benjamin Santer, University of East Anglia2 sources— create a free account to open themView cited source - [15]
"Many rigorous fingerprint studies by multiple research groups worldwide have enhanced confidence in the reality and seriousness of human-caused climate change," said professor Susan Solomon, the Lee and Geraldine Martin professor of environmental studies at MIT.
ReportedContestedSource: Susan Solomon, MIT2 sources— create a free account to open themView cited source - [16]
The review follows a July 2025 U.S. Department of Energy report that challenged the credibility of climate fingerprinting and questioned the scientific basis for the Endangerment Finding; the review's authors call that report 'deeply flawed'.
- [17]
The authors say the DOE assessment fails to reflect both the weight of evidence available in 2009 and significant scientific advances made over the past 17 years.
Sources
1 independent publisher whose own reporting we read for this story.
- phys.orgClimate fingerprints reveal stronger evidence of human-caused warming after more than 30 years
1 article · October 12, 2026
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