Attending to the role of visualizations in discourse formations allows for detecting the emergence of particular visual storylines. This article studies the emergence of visual storylines in energy policy, in particular shale gas controversies. The analysis is based on data gathered in three internet regions: the Netherlands, New York State, and South Africa. The analysis studies how visualizations may contribute to confirmation, disintegration, integration, or polarization of discourse coalitions due to similarities or differences between visual and discursive storylines. From the results, we suggest the notion of visual discourse coalitions (VDCs) to contribute to the study of visualizations and discourses in policy controversies. We define a VDC as a network of actors that share a similar discursive storyline and a similar visual storyline of the controversy. The article shows that visualizations and their graphic characteristics add another dimension to the formation of discourse coalitions and the way they develop, connect, or disconnect.

The internet is an increasingly influential actor and arena for debating emerging sustainability controversies, but studies often overlook the role of visualisations in online spreading of information. This paper offers a way to better understand this role: what images do competing online actors use, are there differences between opponents and proponents, differences between internet regions, and are there shifts in their online visualisations over time? Adopting a controversy studies perspective and the digital methods approach, we studied the online spread of visual information. We compared the use of visualisation about shale gas on top-ranked pages in the internet regions of South Africa, Mexico and the United Kingdom in 2018 and 2019. The results indicate a connection between the actor's standpoints in the controversy and the type of image used. In Mexico, proponents and neutrals used, most of all, photographs of people (officials). Opponents posted more data visuals. South African and British neutral actors used more data visuals, while proponents posted landscapes and opponents photographs of people (protesters). Also, we noticed that changes in the actor's position in the controversy between 2018 and 2019 coincided with changes in the use of type and content of visualisations. Context-specifics of each country offered possible explanations for these shifts in standpoint and visualisation of the controversy. Our study indicates that visuals are highly relevant digital objects in public debate and the decision-making process.

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