Citizen science involves laymen in some steps of a scientific experiment: citizens are volunteers devoting their free time to citizen science projects. Therefore it is important to investigate the factors influencing their motivation and engagement. In this paper, we present our study to investigate the motivation factors of the TESS photometer network participants, an initiative to collect light pollution data. We present the results and insight of our investigation and the instrument we adopted, which can be useful for the broad citizen science community.

Citizen science (CS) is promoted as a useful practice for the achievement of the Sustainable Development Goals (SDGs). In this contribution we explore how CS aligns to the SDGs overarching pledge to ‘Leave no one behind’. We propose a framework to evaluate exclusionary processes in CS. We interlink three dimensions of CS inspired by existing CS typologies with five factors underpinning exclusionary processes. With this, we are able to situate existing literature on various exclusionary effects in CS within a structured framework. We hope this contribution sparks a discussion and inspires practitioners’ reflections on a more inclusive practice in CS.

Acknowledging the consolidation of citizen science, this paper aims to foster a collective debate on two visible gaps of the field. First, how to overcome the limited participation of social sciences and humanities in the broader field of citizen science, still dominated by natural sciences. Second, how to develop a citizen social science that allows for an active participation of citizens and for a critical engagement with contemporary societies. The authors coordinate a state-sponsored program of scientific dissemination within a Portuguese research institution and this paper intends to lay the groundwork for a future project of Citizen Social Science based on a new concept of “engaged citizen social science”.

Undertaking citizen science research in Public Health involving human subjects poses significant challenges concerning the traditional process of ethical approval. It requires an extension of the ethics of protection of research subjects in order to include the empowerment of citizens as citizen scientists. This paper investigates these challenges and illustrates the ethical framework and the strategies developed within the CitieS-Health project. It also proposes first recommendations generated from the experiences of five citizen science pilot studies in environmental epidemiology within this project.

Over 500 delegates took part in the third international ECSA conference in September 2020. Across 30 sessions, as well as keynote talks, e-poster presentations and more informal settings, they discussed and debated a diverse range of subjects related to citizen science. This special edition of ‘JCOM’ brings together some of the central themes that were under the spotlight at ECSA 2020. Since ECSA 2020 has been one of the first examples of a conference that moved completely online, and it has been considered a big success, we also include the Conference Report, as supplementary material with this editorial.

Scientists highlight that actions that address environmental protection and climate change can also help with reducing infectious disease threats. Results using data from a national sample survey in New Zealand indicate that perceptions of co-benefits of actions to address environmental protection that also protect against infectious disease outbreaks such as the coronavirus is associated with policy support and political engagement. This association was partly mediated through perceived collective efficacy. Local councils with higher level of community collective efficacy were more likely to declare climate emergency. Communication about potential co-benefits is likely to shape public engagement and enact policy change.

The promise of CRISPR-Cas9 (CRISPR) genomic editing applied to agriculture is promoted widely by scientists. We utilized textual analysis methods to compare perceptions of this innovation held by various stakeholder groups — scientists, policymakers, farmers, and the general public. Results reveal distinctions in the semantic structure and concepts emphasized across groups. Scientists and policymakers exhibited a high level of technical sophistication while emphasizing the potential societal benefits, while farmers and the general public focused on perceived personal benefits and familiarity with the issue. These results will aid development of message strategies bridging the gap between the scientific community and key publics.

Co-created citizen science offers practical tools for implementing science communication theories by increasing public participation in scientific research, empowering communities and advancing situated scientific knowledge. However, delivering such an approach presents a number of key challenges around funding, fostering working partnerships between scientists and citizens and ensuring all stakeholders receive sufficient benefits from the process. In this essay we draw from science communication and citizen science literature to describe these challenges and discuss the opportunities that will enable co-created practices to prosper.

The inaugural "Mr. Science" Science Communication Conference was held in Suzhou, China on July 9, 2021. It was the largest Chinese conference on science communication study since the start of the 21st century. More than 260 scholars discussed the spirit and culture of science, science communication during the COVID-19 crisis, the public understanding of science, and the ethical aspects of science communication. The conference aimed to develop a system for researching science communication within China. This review outlines the content of the conference and summarizes the key trends in science communication research in China.

A novel and original take on the history of popular science showcases that making science accessible to the public has been part of scientific activity since ancient times. Under this lens, and through twenty-one case studies, current trends such as sci-art and virtual technology can be seen as part of a continuum that was already present in the use of aesthetic and rhetorical tools by the ancient Greeks. Thanks to a careful curation of the collection of texts, this volume as a whole offers more than the sum of its parts (chapters).