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Roger A. Pielke

This essay explores the management and creation of ignorance via an exploration of the landscape of eastern Germany, which has seen profound social, political, and technological changes over the past several decades. Like in many places around the world decision makers in eastern Germany are seeking to reach a future state where seemingly conflicting outcomes related to the economy and the environment are simultaneously realized. The management of ignorance is an important but often overlooked consideration in decision making that the concept of "post-normal science" places into our focus of attention.

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Phil Tattersall

(along the lines of post-normal science) where experts are called upon to cross-check or triangulate results. Methodological Foundation of CBA Community-based auditing (CBA) is an attempt to engage community members as active players in the planning and

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Jerome Ravetz

In this essay I review my own involvement in climate science, and attempt to draw some useful lessons. I start with a critique of the theory of post-normal science (PNS). This is derived from the experience of the effective criticisms of PNS that were made on the blogosphere. I proceed to a critique of climate science itself, which might be described as the attempt to solve a post-normal problem by "normal science" methods. Since quality, in a variety of aspects, became crucial in the Climategate debates, I analyze that concept in the fraught context of a politicized, contested science. Such sciences have the seeds of tragedy for those who innocently engage with them believing that their task is simply to speak truth to power. Finally, out of my personal history I suggest that we keep in mind the personal investment of anyone holding a contested view, and respect their struggles to maintain integrity when their core beliefs are under attack. This motivates the fostering of non-violence in debates on policy science issues.

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Werner Krauss, Mike S. Schäfer, and Hans von Storch

This special symposium grew out of a workshop held in Hamburg in 2011 (Krauss and von Storch 2012) and of a long-term interest in climate research as post-normal science. A decade earlier, Dennis Bray and Hans von Storch (1999) stated that the management of uncertainty and its extension into the political and social realm make climate science a case for post-normal science. Interpreting a survey among German and American climate scientists, they suggested that scientific policy advice is the result of both scientific knowledge and normative judgment.

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Silke Beck

This article explores how the Intergovernmental Panel on Climate Change (IPCC) has dealt with growing public scrutiny of its workings. It reviews recent initiatives set up to respond to the Climategate controversy. An independent review of the IPCC undertaken by an international scientific umbrella body—InterAcademy Council—can be shown to have triggered one of the turning points in the debate, placing the focus of attention on the IPCC's transparency and accountability. However, the council's recommendations have been implemented by the IPCC in such a way that the issue of public trust is treated as one of effective communication. The article then explains how IPCC's responses to Climategate can be traced back to the linear model of expertise. The article concludes with a discussion why the challenge of producing policy-relevant knowledge under conditions of heightened public scrutiny also requires new forms of scientific appraisal aimed at wider publics.

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Jeroen P. van der Sluijs

Uncertainty complexity and dissent make climate change hard to tackle with normal scientific procedures. In a post-normal perspective the normal science task of "getting the facts right" is still regarded as necessary but no longer as fully feasible nor as sufficient to interface science and policy. It needs to be complemented with a task of exploring the relevance of deep uncertainty and ignorance that limit our ability to establish objective, reliable, and valid facts. This article explores the implications of this notion for the climate science policy interface. According to its political configuration the Intergovernmental Panel on Climate Change (IPCC) adopted a "speaking consensus to power" approach that sees uncertainty and dissent as a problematic lack of unequivocalness (multiple contradictory truths that need to be mediated into a consensus). This approach can be distinguished from two other interface strategies: the "speaking truth to power approach," seeing uncertainties as a temporary lack of perfection in the knowledge (truth with error bars) and the "working deliberatively within imperfections" approach, accepting uncertainty and scientific dissent as facts of life (irreducible ignorance) of which the policy relevance needs be explored explicitly. The article recommends more openness for dissent and explicit reflection on ignorance in IPCC process and reporting.

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Surveying the Chemical Anthropocene

Chemical Imaginaries and the Politics of Defining Toxicity

Yogi Hale Hendlin

Story . Boston : Houghton Mifflin Harcourt . Funtowicz , Silvio , and Jerome Ravetz . 1990 . “ Post-Normal Science: A New Science for New Times .” Scientific European 169 : 20 – 22 . Garcia-Johnson , Ronie. 2000 . Exporting