The new centrality of “the public” to the governance of science and technology has been accompanied by a widespread use of public consultation mechanisms designed to elicit from citizens relevant opinions on technoscientific matters. This paper explores the configuration of legitimate constituencies in two such exercises: the UK “GM Nation?” public debate on food biotechnology, and a Swedish “Transparency Forum” on the risks of mobile telephones. We consider the apparently paradoxical combination in these two examples of a tendency to produce static images of the public with a high valuation of mobility—of citizens and their opinions—as the key outcome of deliberation. We discuss the organizers' careful delineation of a distinction between “stakeholders” and the “general public,” and their aversion to any sort of “eventfulness” in public deliberations. Finally, we introduce the classical notion of the “idiot”—the individual who minds exclusively his or her own private affairs— and argue for the need to develop a new vocabulary to evaluate the politics of “listening to the public.

There is in science and technology studies a perceptible new interest in matters of ‘ontology’. Until recently, the term ‘ontology’ had been sparingly used in the field. Now it appears to have acquired a new theoretical significance and lies at the centre of many programmes of empirical investigation. The special issue to which this essay is a contribution gathers a series of enquiries into the ontological and reflects, collectively, on the value of the analytical and methodological sensibilities that underpin this new approach to the make-up of the world. To what extent and in what sense can we speak of a ‘turn to ontology’ in science and technology studies? What should we make of, and with, this renewed interest in matters of ontology? This essay offers some preliminary responses to these questions. First, we examine claims of a shift from epistemology to ontology and explore in particular the implications of the notion of ‘enactment’. This leads to a consideration of the normative implications of approaches that bring ‘ontological politics’ to centre stage. We then illustrate and pursue these questions by using an example – the case of the ‘wrong bin bag’. We conclude with a tentative assessment of the prospects for ontologically sensitive science and technology studies.

This introduction provides an overview of material-or device-centered approaches to the study of public participation, and articulates the theoretical contributions of the four articles that make up this special section. Set against the background of post-Foucaldian perspectives on the material dimensions of citizenship and engagement -perspectives that treat matter as a tacit, constituting force in the organization of collectives and are predominantly concerned with the fabrication of political subjects -we outline an approach that considers material engagement as a distinct mode of performing the public. The question, then, is how objects, devices, settings and materials acquire explicit political capacities, and how they serve to enact material participation as a specific public form. We discuss the connections between social studies of material participation and political theory, and define the contours of an empiricist approach to material publics, one that takes as its central cue that the values and criteria particular to these publics emerge as part of the process of their organization. Finally, we discuss four themes that connect the articles in this special section, namely their focus on 1) mundane technologies, 2) experimental devices and settings for material participation; 3) the dynamic of effort and comfort, and 4) the modes of containment and proliferation that characterize material publics.

The concept of net-zero carbon emissions has emerged from physical climate science. However, it is operationalized through social, political and economic systems. We identify seven attributes of net zero, which are important to make it a successful framework for climate action. The seven attributes highlight the urgency of emission reductions, which need to be front-loaded, and of coverage of all emission sources, including currently difficult ones. The attributes emphasize the need for social and environmental integrity. This means carbon dioxide removals should be used cautiously and the use of carbon offsets should be regulated effectively. Net zero must be aligned with broader sustainable development objectives, which implies an equitable net-zero transition, socio-ecological sustainability and the pursuit of broad economic opportunities.

In March 2014 a group of early career researchers and academics from São Paulo state and from the UK met at the University of Campinas to participate in a workshop on 'Responsible

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