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Trust in science is, to a considerable extent, the outcome of communication. News and online media in particular are important mediators of trust in science. So far, however, conceptual works on mediated trust in science are lacking. Taking a cue from Weingart & Guenther, this commentary proposes a concept of mediated trust in science and for its measurement, and shows where it could be used in the science of science communication.

Peter Weingart and Lars Guenther have written a short but nevertheless comprehensive stock-taking of science communication and the issue of trust. I fully agree with almost all of their theoretical and critical observations. My aim is to critically discuss the understanding of trust as expressed in the traditional discourse on science communication. From my point of view, this concept of trust in science reveals severe shortcomings. As a consequence, communication strategies following this concept could even jeopardize trust in science.

Factors that influence reception and use of information are represented in this koru model of science communication using the metaphor of a growing plant. Identity is central to this model, determining whether an individual attends to information, how it is used and whether access to it results in increased awareness, knowledge or understanding, changed attitudes or behaviour. In this koru model, facts are represented as nutrients in the soil; the matrix influences their availability. Communication involves reorganisation of facts into information, available via channels represented as roots. When information is taken up, engagement with it is influenced by external factors (social norms, support and control) and internal factors (values, beliefs, attitudes, awareness, affect, understanding, skills and behaviour) which affect whether the individual uses it to form new knowledge.

This study applies social network analysis to explore the role that one science festival has played in building the state's STEM learning ecosystem. It examines the breadth and extent of collaboration among STEM educators and their partners, reviewing past and present partnerships across 449 events during the 2015 festival. Three case studies provide in-depth illustrations of partnerships. These findings represent an important step towards (a) mapping a STEM learning ecosystem, and (b) trying to understand how a festival affects the ecosystem itself. Together, study results demonstrate how the festival has served to stimulate and foster STEM partnerships.

Science communication, whether internally or to the general public depends on trust, both trust in the source and trust in the medium of communication. With the new 'ecology of communication' this trust is endangered. On the one hand the very term of science communication has been captured by many different actors (e.g., governments, PR experts, universities and research institutions, science journalists, and bloggers) apart from scientists themselves to whom science communication means different things and whose communication is tainted by special interests. Some of these actors are probably more trusted by the general public than others. On the other hand, the channels that are used to communicate science are also not trusted equally. Particularly the widespread use of social media raises doubts about the credibility of the communication spread through them.

This issue of JCOM presents some interesting challenges relating to trust and the media ecology that supports science communication. Weingart and Guenther have organised a set of commentaries considering the issue of trust and media from different points of view, by asking for responses to their paper 'Science Communication and the Issue of Trust'. The commentaries focus on traditional and social media and the actors that contribute to media content, though they do not consider 'paid for' content (also known as advertising), which is the subject of a paper by Silva and Simonian also published in this issue of JCOM.

This paper contains an overview of the programmes currently existing in Latin America to train science communicators. For such purpose, only postgraduate courses held regularly were considered in the study. Twenty-two programmes meeting such requirement were identified in five countries, 65% of which were in fact established over the past ten years. They present a lot of diversity in terms of admittance requirements, goals, contents, approaches, duration and graduation requirements. However, all of them share the same effort, aiming to offer specific contents in the area of science communication.

In this article it is investigated the relationship between advertising and sustainability by evaluating the perceptions of employees of advertising agencies in the Pan-Amazon region using pre-defined indicators. Seeking to identify the level of environmental practices adopted by advertising agencies toward the goal of building a sustainable society, it was interviewed advertising professionals about whether they saw themselves as contributing to changing consumer society towards a new society based on economic efficiency, social equality and ecological equilibrium. To answer these questions it was used quantitative survey data complemented by qualitative research using in-depth interviews. Results suggest that, from the point of view of advertising professionals, advertising agencies do not have much interest in contributing to a more sustainable society. Moreover, our research showed how the lack of strong ties within advertising trade associations further contribute to the weakness of efforts aimed at this area.

Of all the online information tools that the public relies on to collect information and share opinions about scientific and environmental issues, Twitter presents a unique venue to assess the spontaneous and genuine opinions of networked publics, including those about a focusing event like the Fukushima Daiichi nuclear accident following the 2011 Tohoku earthquake and tsunami. Using computational linguistic algorithms, this study analyzes a census of English-language tweets about nuclear power before, during, and after the Fukushima nuclear accident. Results show that although discourse about the event may have faded rapidly from the news cycle on traditional media, it evoked concerns about reactor safety and the environmental implications of nuclear power, particularly among users in U.S. states that are geographically closer to the accident site. Also, while the sentiment of the tweets was primarily pessimistic about nuclear power weeks after the accident, overall sentiment became increasingly neutral and uncertain over time. This study reveals there is a group of concerned citizens and stakeholders who are using online tools like Twitter to communicate about global and local environmental and health risks related to nuclear power. The implications for risk communication and public engagement strategies are discussed.