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Battling misinformation: The scientific consensus as a gateway belief for climate change and GMOs

By Joseph Timpona
Public debate on scientific topics is in no short supply. Though science recognizes the evidence validating evolution, genetically modified organisms (GMOs), or climate change, it does not take long to find articles or people who oppose regarded scientific facts. In many of these cases, unnecessary debate inhibits positive action. Also, confronting these debates effectively is no trivial task. Studies have shown that administering facts to people may only harden their misguided beliefs. Therefore, finding effective ways to inform the public about issues pertaining to science and society is imperative to driving support for evidence-based policies. A recent PLOS ONE article provided causal evidence that people’s initial assumptions about the scientific consensus on climate change — known as a “gateway belief” — may help shape people’s perceptions of climate change and make them more likely to support action.

A major motivator of climate change doubt is public misunderstanding about the scientific consensus on the issue. Agents of doubt have successfully promoted the false message that it is up for debate among scientists whether human action is causing climate change. This sentiment is untrue. Nine out of every 10 scientists believe that human activities are the primary driver of global climate change. However, only one in 10 Americans correctly estimates that the consensus is this high. Moreover, science demonstrates that knowledge of this consensus can influence whether people acknowledge the fact of climate change.

Testing the Gateway Belief Model

Van der Linden and colleagues hypothesized that study participants would be more convinced of the evidence behind global warming if they knew about the high scientific consensus. Thus, knowledge of the scientific consensus would serve as a gateway belief to facilitate other key beliefs about climate change and support for action. The novelty of their approach was that it would provide causal instead of correlative data — something that has remained elusive in these types of studies.

Through mathematical modeling, the scientists found a direct causal relationship between knowledge of the scientific consensus and support for public action. Also, people who learned of the scientific consensus were more likely to worry about climate change, and believe that the phenomena is happening and caused by humans.

However, following the study, the increase in support for action was not nearly as substantial as the increase in the participant’s ability to correctly estimate the scientific consensus. While understanding of the scientific consensus makes some people more likely to support public action, the gateway belief model will not influence everyone. There are likely other factors involved in making someone support action.

Using the Scientific Consensus to Combat Public Misunderstanding

These results provide promise. The findings indicate that the gateway belief model can be used to inform the public and increase the likelihood that support will be generated for action to be taken. Even if the gateway belief model influences only a fraction of the population to support action, even small shifts in public support for an issue can have expansive consequences. The results beg the question, “Can the gateway belief model be extended to other science issues?”

I would argue that climate change is the most pressing issue in science, with huge impacts for society if it is not addressed in a timely manner. But public discourse on other scientific issues is fraught with similar misunderstandings. For example, data from a Pew research poll that compared differences in opinion between the public and scientists indicated that the biggest gap between the two groups was on the issue of GMOs in food. 88% of AAAS scientists think that it is safe to eat genetically modified foods, while only 37% of adults in the United States believe that it is safe — a gap of 51%. For comparison, the public/scientist gap on climate change being mostly due to human activity was 37%.

Using the scientific consensus as a gateway belief to build support for GMOs in food has not been addressed yet, but it would be interesting to examine for two key reasons. First, it is harder to promote discourse on issues such as GMOs in food because they appeal to people’s core values on different levels. Most of the debate around GMOs is not actually debate about the science, but rather is a debate of values. Second, if the gateway belief model were successful in educating, then it would embolden the idea that it is an effective strategy to combat misinformation and could be extended to other issues such as vaccine denial. If it were not effective at garnering change in GMO understanding, then it would indicate differences between these issues that go beyond the misunderstanding of the scientific consensus.

Curbing Doubt with Science

When trying to communicate topics such as climate change to the public, scientists should consider employing the gateway belief model to best understand how to drive change and engender support. Assaulting people with facts is becoming an antiquated technique in science communication. While informing people of the scientific consensus is technically providing a fact, the existence of a consensus is something that cannot really be disputed, and is far enough removed from the core values of individuals. The use of the gateway belief model then allows people to acknowledge these facts on their own, which is important for maintaining them.


The New Yorker. 2014. “I Don’t Want To Be Right”. [ONLINE] Available at: [Accessed 9 May 15].

van der Linden SL, Leiserowitz AA, Feinberg GD, Maibach EW (2015) The Scientific Consensus on Climate Change as a Gateway Belief: Experimental Evidence. PLoS ONE 10(2): e0118489. doi:10.1371/journal.pone.0118489

Pew Research Center. 2015. Public and Scientists’ Views on Science and Society. [ONLINE] Available at: [Accessed 10 May 15].

Leiserowitz A, Maibach E, Roser-Renouf C, Feinberg G, Rosenthal S (2014) Climate Change in the American Mind: American’s Global Warming Beliefs and Attitudes in April 2014. Yale University and George Mason University. New Haven, CT: Yale Project on Climate Change Communication.​unication/files/Climate-Change-American-​Mind-April-2014.pdf

Featured Image: Greenland’s glaciers have been breaking off into the Atlantic Ocean at an accelerated pace due to the effects of climate change. Photo courtesy of Tim Norris.

  1. Unfortunately, the claim that there is a scientific consensus on GE food safety itself appears to be misinformation. It would seem the majority of medical and public health groups still question the long term safety of GE foods.

    For example, in 2013 the Academy of Nutrition and Dietetics stated :

    “Biotechnology in the form of genetic engineering, commonly referred to as genetically modified organisms, has produced some crops that are biofortified, chemically resistant, and/or pest resistant. There is no consensus on the benefit or harm of this approach and more research is needed to determine the impact on human and environmental health.”

    Numerous medical and public health groups have passed resolutions, etc. with similar statements :

    British Medical Association :

    “Many unanswered questions remain, particularly with regard to the potential long-term impact of GM foods on human health and on the environment. There is a lack of evidence-based research with regard to medium and long-term effects on health and the environment”

    Bundesärztekammer(German Medical Association) :

    “through the application of genetic engineering in the food sector, health risks both during the manufacturing process and also in the consumption of these products cannot be ruled out” “the mandatory labeling of genetically modified food, as well as for food (ingredients), produced with the genetic engineering techniques is stressed for precautionary health protection.” In German : “daß durch die Anwendung der Gentechnik im Ernährungsbereich gesundheitliche Gefahren sowohl während des Herstellungsprozesses wie auch beim Verzehr dieser Produkte nicht auszuschließen”

    Chartered Institute of Environmental Health (CIEH):

    “there are no robust techniques available to monitor the impact of genetic engineering in the food industry or on health or on the environment. Genetic engineering should not be used in the production of human food or animal feeding stuffs or released into the environment until such techniques are in place.”

    Viennese Doctors’ Chamber (Ärztekammer für Wien) :

    “Long-term analyses (over a period of at least 30 years) must be made in regard to nutritive, anti-nutritive, toxic and allergenic contents to establish unintended changes caused by the genetic modification.” “The release of transgenic species in nature must still be strictly opposed as the results can neither be estimated nor reversed.”

    American College of Physicians :

    “Lack of labeling denies health professionals the ability to trace potential toxic or allergic reactions to, and other adverse health effects from, genetically engineered food” “the American College of Physicians-American Society of Internal Medicine (ACP-ASIM) strongly encourage the study of the long-term impact of genetic engineering on the food supply and human health.”
    See : Additional Testimony for Resolution 14-S11, Supporting Federal Legislation and/or Regulations that Require Clearly Labeling Food with Genetically Engineered Ingredients

    Australian Medical Association (AMA) :

    “Genetically modified foods have been developed and introduced without regard for full and independent safety evaluation, or full and adequate public consultation or rigorous assessment of health impacts.”

    And so on…

    If a consensus on climate change is determined by climate scientists, then a consensus on GE food safety should be determined by the opinion of health experts like the opinion of medical and public health groups. Claims of a consensus on GE food safety should not come from a survey of some members of a general science group where many of the scientists surveyed appear to be agricultural scientists with a potential conflict of interest, social scientists with no qualifications to assess safety and likely little knowledge about GE foods, etc.

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