Around 97% of climate scientists endorse anthropogenic global warming (AGW), the theory that human activities are partly responsible for recent increases in global average temperatures. Clearly, this widespread endorsement of AGW is a reason for non-experts to believe in AGW. But what is the epistemic significance of the fact that some climate scientists do not endorse AGW? This paper contrasts expert unanimity, in which virtually no expert disagrees with some theory, with expert consensus, in which some non-negligible proportion either rejects (...) or is uncertain about the theory. It is argued that, from a layperson’s point of view, an expert consensus is often stronger evidence for a theory’s truth than unanimity. Several lessons are drawn from this conclusion, e.g. concerning what laypeople should infer from expert pronouncements, how journalists should report on scientific theories, and how working scientists should communicate with the public. (shrink)

Feyerabend is infamous for his defense of pluralism, which he extends to every topic he discusses. Disagreement, a by-product of this pluralism, becomes a sign of flourishing critical communities. In Feyerabend’s political works, he extends this pluralism from science to democratic societies and incorporates his earlier work on scientific methodology into a procedure for designing just policy. However, a description and analysis of Feyerabend’s conception of disagreement is lacking. In this paper, I reconstruct and assess Feyerabend’s conception of disagreement, with (...) a particular emphasis on the role of experts, and its role in the formation of science policy. I go on to assess this argument in light of recent literature on manufactured disagreement on politically contentious science policy. I conclude by suggesting some prospects and problems for de-idealizing Feyerabend’s position on disagreement to see whether it may be plausibly implemented. (shrink)

We provide an analysis of the public's having warranted epistemic trust in science, that is, the conditions under which the public may be said to have well-placed trust in the scientists as providers of information. We distinguish between basic and enhanced epistemic trust in science and provide necessary conditions for both. We then present the controversy regarding the connection between autism and measles–mumps–rubella vaccination as a case study to illustrate our analysis. The realization of warranted epistemic public trust in science (...) requires various societal conditions, which we briefly introduce in the concluding section. (shrink)

This paper reviews current debates in social epistemology about the relations ‎between ‎knowledge ‎and consensus. These relations are philosophically interesting on their ‎own, but ‎also have ‎practical consequences, as consensus takes an increasingly significant ‎role in ‎informing public ‎decision making. The paper addresses the following questions. ‎When is a ‎consensus attributable to an epistemic community? Under what conditions may ‎we ‎legitimately infer that a consensual view is knowledge-based or otherwise ‎epistemically ‎justified? Should consensus be the aim of scientific inquiry, and (...) if so, what ‎kind of ‎consensus? How should dissent be handled? It is argued that a legitimate inference ‎that a ‎theory is correct from the fact that there is a scientific consensus on it requires taking ‎into ‎consideration both cognitive properties of the theory as well as social properties of ‎the ‎consensus. The last section of the paper reviews computational models of ‎consensus ‎formation.‎. (shrink)

Paul Hoyningen-Huene argues that what makes scientific knowledge special is its systematic character, and that this can be used to solve the demarcation problem. He labels this STDC: “Systematicity Theory’s Demarcation Criterion.” This paper argues that STDC fails, because there are areas of intellectual activity that are highly systematic, but that the great majority of scientists and historians and philosophers of science do not accept as scientific. These include homepathy, creationism, and climate change denial. I designate these activities “facsimile sciences” (...) because they mimic the appearance of science but are not, by the standards of philosophers and scientists, scientific. This suggests that we need additional criteria to demarcate science from non-science and/ or nonsense. (shrink)

Climate change adaptation is largely a local matter, and adaptation planning can benefit from local climate change projections. Such projections are typically generated by accepting climate model outputs in a relatively uncritical way. We argue, based on the IPCC’s treatment of model outputs from the CMIP5 ensemble, that this approach is unwarranted and that subjective expert judgment should play a central role in the provision of local climate change projections intended to support decision-making.

An important epistemic issue in climate modelling concerns structural uncertainty: uncertainty about whether the mathematical structure of a model accurately represents its target. How does structural uncertainty affect our knowledge and predictions about the climate? How can we identify sources of structural uncertainty? Can we manage the effect of structural uncertainty on our knowledge claims? These are some of the questions that an epistemology of structural uncertainty faces, and these questions are also important for climate scientists and policymakers. I develop (...) three desiderata for an epistemological account of structural uncertainty. In my view, an account of structural uncertainty should identify sources of structural uncertainty, explain how these sources limit the applicability of a model, and show how the severity of structural uncertainty depends on the questions that can be asked of a model. I argue that analyzing structural uncertainty by paying attention to the details of model building can satisfy these desiderata. I focus on parametrizations, which are representations of important processes occurring at scales that are not resolved by climate models. Parametrizations are often thought to be ad-hoc, but I show that some important parametrizations are theoretically justified by explicit or implicit scale separation assumptions. These assumptions can also be supported empirically. Analyzing these theoretical and empirical justificatory roles of the scale separation assumptions can provide insights into how parametrizations contribute to structural uncertainty. I conclude by sketching how my approach can satisfy the desiderata I set out at the beginning, highlighting its importance for policy-relevant scientific statements about the climate. (shrink)

The evidence most of us have for our beliefs on global climate change, the extent of human contribution to it, and appropriate anticipatory and mitigating actions turns crucially on epistemic trust. We extend trust or distrust to many varied others: scientists performing original research, intergovernmental agencies and those reviewing research, think tanks offering critique and advocating skepticism, journalists transmitting and interpreting claims, even social systems of modern science such as peer-reviewed publication and grant allocation. Our personal experiences and assessments of (...) evidential indicators themselves may be buttressed significantly by trust, not just in. (shrink)

As the specter of climate change looms on the horizon, people will face complex decisions about whether to support climate change policies and how to cope with climate change impacts on their lives. Without some grasp of the relevant science, they may find it hard to make informed decisions. Climate experts therefore face the ethical need to effectively communicate to non-expert audiences. Unfortunately, climate experts may inadvertently violate the maxims of effective communication, which require sharing communications that are truthful, brief, (...) relevant, clear, and tested for effectiveness. Here, we discuss the ‘mental models’ approach towards developing communications, which aims to help experts to meet the maxims of effective communications, and to better inform the judgments and decisions of non-expert audiences. (shrink)

A consensus in a scientific community is often used as a resource for making informed public-policy decisions and deciding between rival expert testimonies in legal trials. This paper contains a social-epistemic analysis of the high-profile Bendectin drug controversy, which was decided in the courtroom inter alia by deference to a scientific consensus about the safety of Bendectin. Drawing on my previously developed account of knowledge-based consensus, I argue that the consensus in this case was not knowledge based, hence courts’ deference (...) to it was not epistemically justified. I draw sceptical lessons from this analysis regarding the value of scientific consensus as a desirable and reliable means of resolving scientific controversies in public life. (shrink)

We examined whether differences in climate-friendly choices between the supporters of left-wing and right-wing ideologies are based on different moral foundations. Moreover, we compared general and issue-specific endorsement of moral foundations applied to climate change. Study 1 examined the endorsement of general moral foundations of university students living in Finland. Individualizing foundations were associated with increased climate-friendly choices and binding foundations were associated with decreased climate-friendly choices; the endorsement of moral foundations made the effect of political orientation disappear. In Study (...) 2 we developed and tested an issue-specific measure of moral foundations. The issue-specific endorsement of both types of foundations was directly associated with increased climate-friendly consumption. Binding foundations were associated with the avoidance of climate-friendly choices through right-wing orientation. These findings increase our understanding of differences between general and issue-specific moral concerns and their association to political orientation and pro-environmental behavior. (shrink)

General science literacy contributes to good public decision‐making about technology and medicine. This essay explores the kinds of science literacy currently developed by public education in the United States of America. It argues that current curricula on “science as inquiry” (formerly the “nature of science”) need to be brought up to date with the inclusion of discussion of social epistemological concepts such as trust and scientific authority, scientific disagreement versus science denialism, the role of ideology and bias in scientific research, (...) and the importance of peer review and responsiveness to criticism. (shrink)

Science advisory committees exercise complex collaborative expertise. Not only do committee members collaborate, they do so across disciplines, producing expert reports that make synthetic multidisciplinary arguments. When reports are controversial, critics target both report content and committee process. Such controversies call for the assessment of expert arguments, but the multidisciplinary character of the debate outstrips the usual methods developed by informal logicians for assessing appeals to expert authority. This article proposes a multi-dimensional contextualist framework for critical assessment and tests it (...) with a case study of the controversies over reports issued by the Intergovernmental Panel on Climate Change. The case study shows (1) how the critical contextualist framework can illuminate the controversy and guide evaluation of the various arguments and counterarguments; (2) how cases of this sort open up avenues for fruitful interdisciplinary collaboration between argumentation theorists and other fields; and (3) where further work is required in argumentation theory. (shrink)

Models all the way down Content Type Journal Article Pages 1-6 DOI 10.1007/s11016-011-9558-9 Authors Naomi Oreskes, Department of History, University of California, San Diego La Jolla, CA 92093-0104, USA Journal Metascience Online ISSN 1467-9981 Print ISSN 0815-0796.

Scientific experts have confirmed that anthropogenic warming is underway, and some degree of adaptation is now unavoidable. However, the details of impacts on the scale of climate change at which humans would have to prepare for and adjust to them are still the subject of considerable research, inquiry, and debate. Planning for adaptation requires information on the scale over which human organizations and institutions have authority and capacity, yet the general circulation models lack forecasting skill at these scales, and attempts (...) to “downscale” climate models are still in the early stages of development. Because we do not know what adaptations will be required, we cannot say whether they will be harder or easier—more expensive or less—than emissions control. Whatever improvements in regional predictive capacity may come about in the future, the lack of current predictive capacity on the relevant scale is a strong argument for why we must both control greenhouse gas emissions and prepare to adapt. (shrink)

Science progresses through debate and disagreement, and scientific controversies play a crucial role in the growth of scientific knowledge. However, not all controversies and disagreements are progressive in science. Sometimes, controversies can be pseudoscientific; in fact, bogus controversies, and what seem like genuine scientific disagreements, can be a distortion of science set up by non-scientific actors. Bogus controversies are detrimental to science because they can hinder scientific progress and eventually bias science-based decisions. The first goal of this paper is to (...) elucidate the distinction between bogus and genuine scientific controversies and provide a qualitative methodology, based on the literature on expertise, for distinguishing between the two. We will illustrate six epistemic criteria for distinguishing bogus from genuine scientific debates in science and medicine. This heuristic strategy applies directly to scientific reports, and it relies mostly on the social structure of science. We will then apply the above criteria to a case study: the controversy over statins, which are widely prescribed drugs for reducing the level of cholesterol and preventing cardiovascular disease. (shrink)

The purpose of this paper is to offer a sympathetic reconstruction of the political thought of Paul Feyerabend. Using a critical discussion of the idea of the ‘free society’ it is suggested that his political thought is best understood in terms of three thematic concerns – liberation, hegemony, and the authority of science – and that the political significance of those claims become clear when they are considered in the context of his educational views. It emerges that Feyerabend is best (...) understood as calling for the grounding of cognitive and cultural authorities – like the sciences – in informed deliberation, rather than the uncritical embrace of prevailing convictions. It therefore emerges that a free society is best understood as one of epistemically responsible citizenship rather than epistemically anarchistic relativism of the ‘anything goes’ – a striking anticipation of current debates about philosophy of science in society. (shrink)

In a recent editorial published in Nature, the journal's editors comment on a new automated software that has been used to check findings in psychology publications. The editors express concern with the way in which the anonymous fact-checkers have proceeded, but at the same time, they underscore the crucial role of peer criticism for scientific progress and insist: "self-correction is at the heart of science." Brief as it is, the editorial showcases that peer criticism and the application of norms of (...) good research practice are very thorny issues indeed.It is essential for the functioning of science that empirical findings, arguments, as well as methodological approaches are scrutinized... (shrink)

In this paper I argue that the appropriate analogy for “understanding what makes simulation results reliable” in global climate modeling is not with scientific experimentation or measurement, but—at least in the case of the use of global climate models for policy development—with the applications of science in applied design problems. The prospects for using this analogy to argue for the quantitative reliability of GCMs are assessed and compared with other potential strategies.

The United Kingdom Climate Impacts Program’s UKCP09 project makes high-resolution forecasts of climate during the 21st century using state of the art global climate models. The aim of this paper is to introduce and analyze the methodology used and then urge some caution. Given the acknowledged systematic errors in all current climate models, treating model outputs as decision relevant probabilistic forecasts can be seriously misleading. This casts doubt on our ability, today, to make trustworthy, high-resolution predictions out to the end (...) of this century. (shrink)

This is the second of three parts of an introduction to the philosophy of climate science. In this second part about modelling climate change, the topics of climate modelling, confirmation of climate models, the limits of climate projections, uncertainty and finally model ensembles will be discussed.

The United Kingdom Climate Impacts Programme’s UKCP09 project makes high-resolution projections of the climate out to 2100 by post-processing the outputs of a large-scale global climate model. The aim of this paper is to describe and analyse the methodology used and then urge some caution. Given the acknowledged systematic, shared errors of all current climate models, treating model outputs as decision-relevant projections can be significantly misleading. In extrapolatory situations, such as projections of future climate change, there is little reason to (...) expect that post-processing of model outputs can correct for the consequences of such errors. This casts doubt on our ability, today, to make trustworthy probabilistic projections at high resolution out to the end of the century. (shrink)

Economists reason causally. Like many other scientists, they aim at formulating justified causal claims about their object of study. This thesis contributes to our understanding of how causal reasoning proceeds in economics. By using the research on the causes of unemployment as a case study, three questions are adressed. What are the meanings of causal claims? How can a causal claim be adequately supported by evidence? How are causal beliefs affected by incoming facts? In the process of answering these semantic, (...) epistemic and dynamical questions, the richness of causal reasoning in economics is brought to the foreground. In the part on semantics, it is argued that the meaning of causal generalizations in policy-oriented economics is best captured by using the concept of ‘inferential relation’ rather than the one of ‘referential relation’. This part contributes to develop an inferentialist semantics by distinguishing among types of inferential relations. In the part on epistemology, it is argued that justification in sciences like economics often relies, and ought to rely, on evidential variety―i.e. the combination of evidence from multiple sources. An interpretation of independence among evidential sources is offered: two evidential sources are fully independent if and only if the reasons why they would be unreliable do not overlap. It is then shown that the variety-of-evidence thesis does not hold under extreme circumstances. The part on dynamics focuses on deviant-case study. A storyline is provided for what deviant-case study aims at and how it proceeds in what is characterized as an ‘eclectic science’. (shrink)

Discussion of global climate change is shaped by the intellectual categories developed to address capitalism and globalization. Yet climate change is only one manifestation of humanity’s varied and accelerating impact on the Earth System. The common predicament that may be anticipated in the Anthropocene raises difficult questions of distributive justice – between rich and poor, developed and developing countries, the living and the yet unborn, and even the human and the non-human – and may pose a challenge to the categories (...) on which our traditions of political thought are based. Awareness of the Anthropocene encourages us to think of humans on different scales and in different contexts – as parts of a global capitalist system and as members of a now-dominant species – although the debate is, for now, still structured by the experiences and concepts of the developed world. (shrink)

My analysis of political debate in the United Kingdom during the summer of 2016 unpacks the compression of two highly complex issues within an unprecedented moment in British politics: reinvestment in nuclear arms and nuclear energy during the EU referendum crisis. I recover unities and discontinuities across events in this period and throughout history both to examine the non-identity between the particular and the universal as a major trope in parliamentary rhetoric, which construed the universal sentiment of world peace and (...) denied this in terms of security, and to seek out the use of determinate negation, especially when it has bearing on the advancing of climate-related policies. From nuanced speeches in the House of Commons and House of Lords, I move tentatively outwards by gesturing to the moment of truth in reified concepts, seeking to pry them open in their non-identity with art objects of the Anthropocene that are understood within a context of ecological poetics. (shrink)

The goal of this dissertation is to contribute to the epistemology of science by addressing a set of related questions arising from current discussions in the philosophy and science of climate change: (1) Given the imperfection of computer models, how do they provide information about large and complex target systems? (2) What is the relationship between consilient reasoning and robust evidential support in the production of scientific knowledge? (3) Does taking the mean of a set of model outputs provide epistemic (...) advantages over using the output of a single ‘best model’? Synthesizing research in philosophy and science, the thesis analyzes connections among consilient inductions, robustness analysis, and the aggregation of various sources of evidence, including computer simulations, by investigating case studies of climate change that exemplify the strength of consilient reasoning and the security of robust evidential support. It also explains the rationale and epistemic conditions for improving estimates by averaging multiple estimates, comparing a simple case of averaging estimates to practices in multi-model ensemble studies. I argue: (A) the concepts of consilience and robustness account for the strength and security of inferences that rely on imperfect computer modelling methods, (B) consilient reasoning is conducive to attaining robust evidential support, and (C) an analogy can explain why averaging the outputs of multiple models can improve estimates of a target system, given that conditions of model independence, skill and unequal weighting are taken into account. (shrink)