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This book is open access under a CC BY 4.0 license. This book brings together research findings and experiences from science, policy and practice to highlight and debate the importance of nature-based solutions to climate change adaptation in urban areas. Emphasis is given to the potential of nature-based approaches to create multiple-benefits for society. The expert contributions present recommendations for creating synergies between ongoing policy processes, scientific programmes and practical implementation of climate change and nature conservation measures in global urban areas

climate change; cities; society; biodiversity; mitigation; impact

Policy and science show great interest in citizen science as a means to public participation in research. To recognize how citizen science is perceived to foster joint working at the science-society-policy interface, a mutual understanding of the term "citizen science" is required. Here, we assess the conceptualisation and strategic use of the term "citizen science" in policy through a qualitative content analysis of 43 international policy documents edited by governments and authorities. Our results show that most documents embrace the diversity of the research approach and emphasize the many benefits that citizen science may provide for science, society, and policy. These include boosting spatio-temporal data collection through volunteers, tapping into distributed knowledge domains, increasing public interest and engagement in research, and enhancing societal relevance of the respective research. In addition, policy documents attribute educational benefits to citizen science by fostering scientific literacy, individual learning, and skill development, as well as by facilitating environmental stewardship. Through active participation, enhanced ownership of research results may improve policy decision-making processes and possibly democratise research as well as public policy processes, although the latter is mentioned only in a few European Union (EU) documents. Challenges of citizen science mentioned in the analysed policy documents relate mainly to data quality and management, to organisational and governance issues, and to difficulties of the uptake of citizen science results into actual policy implementation due to a lack of citizen science alignment with current policy structures and agendas. Interestingly, documents largely fail to address the benefits and challenges of citizen science as a tool for policy development, i.e., citizen science is mainly perceived as only a science tool. Overall, policy documents seem to be influenced strongly by the citizen science discourse in the science sector, which indicates a joint advocacy for citizen science.

The articles in this issue frame challenges and opportunities for citizen science, crowdsourcing, and policy development, and provide relevant case studies in local, regional, national, and international contexts. Topics span from local invasive species management to global sustainable development, and provide both frameworks and recommendations for further consideration.

Citizen Science bedeutet Engagement von Bürgerinnen und Bürgern in der konkreten Bearbeitung wissenschaftlicher Themen. Diese sind vielfach von hoher gesellschaftlicher Relevanz. Als Form der aktiven Teilhabe der Öffentlichkeit bei Problemlösungsprozessen erlangt Citizen Science in Deutschland verstärkt sowohl wissenschaftliche, als auch gesellschaftliche und politische Bedeutung. Dies bietet Chancen, das strukturelle, soziale, wissenschaftliche und politische Innovationspotenzial von Citizen Science stärker in die Forschung zu integrieren. [.]

Citizen Science bedeutet Engagement von Bürgerinnen und Bürgern in der konkreten Bearbeitung wissenschaftlicher Themen. Diese sind vielfach von hoher gesellschaftlicher Relevanz. Als Form der aktiven Teilhabe der Öffentlichkeit bei Problemlösungsprozessen erlangt Citizen Science in Deutschland verstärkt sowohl wissenschaftliche, als auch gesellschaftliche und politische Bedeutung. Dies bietet Chancen, das strukturelle, soziale, wissenschaftliche und politische Innovationspotenzial von Citizen Science stärker in die Forschung zu integrieren. [...]