On July 19, the President posted on the social media platform that he owns:
The National Academy of Sciences has historically published analytical Scientific Manuals expressly for our Federal Judiciary. Of course, the Academy has been run by Radical Left Dumocrats who, it turns out, published fraudulent, biased, and misleading Manuals on Climate Change. These bogus Manuals were used by Judges to decide massive “Climate Change” Cases, and have created huge losses across our Country. These Manuals have been totally DISCREDITED. Our Nation’s Federal Judges deserve Facts and Science, not Political Fraud and False Science on Climate. With this TRUTH, I hereby order Federal Suspension and Debarment Officials to review this conduct. Our Taxpayers should not be funding Climate Fraud, and Judges should never have relied upon it. Thank you for your attention to this matter! President DONALD J. TRUMP
When I heard about this post, I assumed that I would trust the National Academies manual that Trump was denouncing. This was an interesting reaction because I had not seen the document.
I then looked at it (and you can too). It struck me as cogent, informative, and cautious. But I do not independently know whether its claims are true.
Nor do its authors. For the most part, the document refers to large, organized groups, such as the Intergovernmental Panel on Climate Change and the National Research Council. But consider a scientist whose work is very close to the natural phenomena: collecting and measuring atmospheric samples. This person knows what they are doing but not what everyone else’s samples show, let alone how to build the instruments that they all use. And current CO2 concentrations are only some of the variables that we must measure to understand the climate. The vast majority of what any individual scientist knows comes from reports of what others have done.
As the report that Trump denounced says,
The Earth’s climate system is enormous and complex, consisting of many nested and interlinked subsystems, including the atmosphere, hydrosphere, cryosphere, lithosphere, and biosphere. …. Owing to the breadth and complexity of the climate system, climate research spans many different scientific disciplines. For example, research on the physical science of climate and climate change (i.e., understanding of the physical properties of the climate system and how it is changing) encompasses: (1) mathematics and statistics; (2) basic sciences, e.g., physics and chemistry; (3) earth sciences, e.g., atmospheric sciences, climatology, physical geography, oceanography, meteorology, hydrology, biogeochemistry, and cryospheric sciences; and (4) computer sciences and data analysis. Most climate research involves collaboration across these different fields (National Academies 2025)
The chemists must trust the oceanographers, who must trust the computer scientists. In fact, each chemist must trust the other chemists.
Perhaps all of science depends on trust, although that is less obvious in classic cases, like Galileo dropping objects from the Tower of Pisa, than in climate science. The study of the earth’s climate is intensely collaborative, involving many more people than could ever know each other. It depends on the Integrated Assessment Models, which have developed for more than fifty years (Van Beek, Hajer, Pelzer, van Vuuren & Cassen 2020). Anyone who contributes to these models must presume that the previous contributions have been generally reliable, even when new data changes some of the current findings.
Why do I trust those models? Why do I trust the National Academies summaries of them, or Karen Zraick’s New York Times article that drew my attention to Trump’s “TRUTH”?
On one hand, I have no doubt that the cautiously presented conclusions of the National Academies are valid. On the other hand, my confidence has a sociological explanation. Institutions like universities, scientific disciplines, and the Times have treated me well all my life. I have benefited from operating with an overall model that incorporates confidence in what these institutions say plus direct observations that concur with their findings. I have observed the climate get hotter in New England, but I only believe that this is a global trend and a function of humans’ burning carbon because I believe in institutions, like The New York Times, that report on institutions like the National Academies.
Few people are treated as well or have as much experience with these institutions as I do; I am a college professor in the United States. It is unreasonable to ask people to trust institutions that are unaccountable to them and distant from them. I think that scientific institutions can adjust their behavior to be somewhat less distant from the public, but they cannot bear that responsibility alone.
The classic solution has been intermediary organizations that obtain people’s trust and then independently present information. An important example was the 20th century city or town newspaper. In 1972, the General Social Survey (GSS) found that 69 percent of Americans read a newspaper daily.
Some 20th century US newspapers had specific social or ideological slants, but the market was dominated by local monopoly publications. Like the broadcast television networks of the same period, newspapers would have presented the American Academies’ position on the climate as scientific truth. In those days, Trump’s response would have been much more marginal.
In 1998 and 2008, the GSS asked people whether we trust too much in science. In both years, those who never read a newspaper were much more likely to distrust science than those who did read one. When I made a model that controled for age, race, gender, and years of education, reading the newspaper still predicted less distrust in science, net of the other factors (p <.001).
This doesn’t mean that newspapers caused people to trust science. It could be the other way around–people who trusted science subscribed to newspapers. But I think that newspapers devoted resources and skill to building trust and then guided people’s reactions to other institutions, such as science.
The recipe that sustained metropolitan daily newspapers during the 1900s included hard news plus human-interest stories, comics, sports, gossip, and other features aimed at various members of each household, all funded by a combination of revenue from subscribers and advertisers. Once the internet captured advertising revenue, this model disintegrated. By 2014, just one-quarter of respondents told the GSS that they read a newspaper daily, and the GSS subsequently retired the question, as it ceased to be a useful measure of news consumption.
All intermediary institutions have “business models” of some kind. A 20th century newspaper relied on subscribers and advertisers. An American high school typically gets most of its resources from local property taxes in return for training and minding the community’s teenagers and providing sports and entertainment. Among other things, a school teaches scientific findings and respect for science. Similarly, a public university in the United States offers job training and credentials, health services, quasi-professional sports, patented inventions, and high culture in return for tuition, donations, state subsidies, and fees. Meanwhile, the big social media platforms use algorithms to attract attention, which they sell to advertisers.
Each business model determines the institution’s results, including its impact on trust or distrust for science. Metropolitan daily newspapers tended to boost trust, while today’s social media degrade it.
Trust in science is not self-evidently good; in fact, we can trust too much. And the fact that most newspapers were local monopolies was problematic. They generated trust, but arguably at the expense of freedom. The question is whether we can invent business models for the 21st century that yield genuinely civic outcomes.
Sources: National Academies of Sciences, Engineering, and Medicine. 2025. Reference Manual on Scientific Evidence: Fourth Edition. Washington, DC: The National Academies Press; Van Beek, L., Hajer, M., Pelzer, P., van Vuuren, D., & Cassen, C. (2020). Anticipating futures through models: the rise of Integrated Assessment Modelling in the climate science-policy interface since 1970. Global Environmental Change, 65, 102191.
See also: my own trust in institutions; mixed thoughts about the status of science; the Pew climate change survey and the state of science (2016); Civic Engagement in American Climate Policy:
Collaborative Models etc.