Japan's Structural Reproduction of Climate Skepticism (How Doubt Circulates)

Scientific doubt and manufactured doubt look alike. That is precisely what makes doubt manufacturing effective.

The Sixth Assessment Report (AR6) of IPCC concluded that it is "unequivocal" that human influence has warmed the climate system. This wording represents the strongest affirmation used in domains where scientific consensus has been established.

Yet in Japan's public discourse, claims such as "Is the Earth truly warming?", "I doubt that human activity is the cause", and "Increased CO₂ promotes plant growth" continue to circulate through books, television, and social media. This is not scientific debate — it is the manufacturing of doubt that makes a settled question appear still open.

As analyzed in The Doubt Industry (Sixty Years of War over Tobacco and Climate), doubt manufacturing has a history of being organized as an industry. The circulation of climate skepticism in Japan is a phenomenon in which a global doubt-manufacturing network overlaps with a distinctly domestic mediation structure.

International Origins of Skepticism and Its Influx into Japan

What Oreskes and Conway (2010) demonstrated in Merchants of Doubt was the existence of organized doubt manufacturing that applied the tobacco industry's strategies. The same group of strategists ran campaigns emphasizing "scientific uncertainty" across different topics — acid rain, ozone depletion, and climate change.

This international skepticism network flows directly into Japan. Through translated books, selective citation of English-language literature, and invited lectures by overseas skeptics, an impression is created that "even abroad, questions are being raised." In countries where skepticism is not mainstream, amplifying the voices of skeptics generates the false impression that "the scientific community is divided."

Japan's Distinctive Mediation Structure

There is a domestic mediation structure unique to Japan in how climate skepticism circulates.

One issue lies in popular science books. Books framed as "questioning the conventional wisdom of science" have been published, presenting established findings as "not yet settled." These borrow the form of critical thinking but are in substance the commercial circulation of scientific doubt. A common structure characterizes IPCC reports as "political documents" and positions the claims of individual scientists as independent of them.

Television's balance doctrine presents another problem. Program formats that say "on the other hand, there is this view" produce the effect of treating the scientific consensus and minority opinions as equivalent. By inviting both climate scientists and skeptics to the same debate panel, viewers come to perceive that "even among experts, opinions are divided." The paradox in which this formal balance produces substantive bias is called "false balance" in media studies.

Energy policy entanglements add yet another layer. In Japan, debates over nuclear energy and climate change skepticism are complexly intertwined. The claim that "CO₂ problems are being overstated to support opposition to nuclear power" and the claim that "global warming theory is being exploited to promote renewables" have the same effect: both reduce the scientific certainty of climate change to a political context.

The Reception Structure of Doubt

For doubt to circulate, there must also be a structure to receive it.

Attitude surveys conducted by the National Institute for Environmental Studies show that the proportion of respondents who consider climate change "a serious problem" tends to be lower in Japan compared to major European countries. This is not a matter of indifference — it is a matter of the "structure of access to scientific consensus." The IPCC report was written in English, and even its summary contains much scientific terminology. The Japanese-language information that ordinary citizens can consult as "reliable" consists of content that has been processed and selected through media.

In this structure, doubt manufacturing functions as a "substitute for science." Books and programs that convey the impression that "the issue is not simple" without requiring the effort to read the IPCC report provide an information shortcut.

Three Methods of Doubt Manufacturing

The methods used to circulate climate skepticism in Japan can be broadly classified into three types.

The first is cherry-picking data. Rather than addressing long-term temperature trends, a specific year-to-year variation is highlighted to claim that "warming has stopped." Data from the Japan Meteorological Agency clearly shows a long-term warming trend, but extracting short-term fluctuations allows a different impression to be created.

The second is impersonating authority. Researchers and engineers who are not climate science specialists speak "as scientists" in support of skepticism. If a title includes "researcher" or "doctorate," general readers find it difficult to judge whether the relevant field of expertise applies.

The third is a conspiratorial framing. The explanation that "warming theory was created for the benefit of specific interests" plants doubt without refuting scientific evidence. Regardless of whether the account of vested interests is accurate, the doubt that "we may be being deceived" erodes trust in scientific consensus.

The Asymmetry between Verified Knowledge and Manufactured Doubt

The right column of this table represents the typical content of "manufactured doubt." Each claim has been repeatedly refuted scientifically as incorrect. Yet for the purpose of "planting doubt," these claims continue to circulate without being updated by refutation.

The core insight of the agnotology advanced by Proctor is that "ignorance is not a simple absence of knowledge but something that is produced." Climate change skepticism is not ignorance arising from a lack of knowledge — it is ignorance actively produced and circulated as doubt.

The Asymmetric Cost of Knowledge Production

As The Asymmetry of Epistemic Costs (The Structure That Makes Not-Knowing a Rational Choice) argues, there is an asymmetry between "the cost of obtaining accurate knowledge" and "the cost of accepting doubt."

The IPCC AR6 report runs to thousands of pages; even the summary contains technical content. Reading and understanding it requires time, language ability, and scientific literacy. By contrast, the skeptical claim that "even experts have doubts" can be conveyed through a short video or a book headline. This asymmetric cost makes doubt manufacturing a rational business. Communicating scientific consensus requires careful explanation, but dismantling it requires only "raising a question."

Conditions for Counteraction

Counteracting the circulation of skepticism requires more than asserting the accuracy of information.

The existence of advocacy institutions such as JCCCA is important, but it is difficult to keep pace with the speed and scale of doubt manufacturing. "Fact-checking" can point out factual errors but does not resolve the emotional function of doubt.

What is effective is "showing the structure" of doubt manufacturing. Rather than pointing out the errors in individual claims, posing the questions "why does this kind of claim circulate?" and "who benefits?" changes the circuit through which doubt is received. As The Doubt Industry (Sixty Years of War over Tobacco and Climate) demonstrates, revealing the historical context of doubt manufacturing is one of the most effective countermeasures.

Related: The Doubt Industry (Sixty Years of War over Tobacco and Climate) | Strategic Ignorance in EBPM | The Asymmetry of Epistemic Costs