The article presents results of a research project aiming to develop theoretical and empirical contributions on participatory approaches and methods of citizen science for risk mapping and adaptation to climate change. In the first part, the paper presents a review of the literature on key concepts and perspectives related to participatory citizen science, introducing the concept of the “right to research”. It highlights the mutual fertilization with participatory mapping methods to deal with disaster situations associated to climate change. In the second part, the paper describes and presents the results and conclusions of an action-research developed on the coastline between the states of São Paulo and Rio de Janeiro, Brazil in 2017–2018. It involved affected communities as protagonists in mapping and managing risks of natural disasters caused by extreme climate events, by combining citizen science approaches and methods with Participatory Geographic Information Systems (PGIS) and social cartography. The article concludes by pointing out the contributions and limits of the “right to research” as a relevant Social Science approach to reframe citizen science from a democratic view.

This paper examines barriers and opportunities for climate change adaptation in an urban coastal setting where adaptation is in its infancy. It draws on a diagnostic framework as a foundation for identifying and organising barriers and opportunities in terms of three broad phases of the adaptation process, i.e. (1) understanding the problem, (2) planning adaptation options and (3) managing implementation of such options. Data come from the analysis of documents (e.g. policy, plans and reports) and a survey of 49 representatives from 42 organisations (e.g. government, environmental non-governmental organisations, businesses and local industry and professional associations). Nineteen barriers and/or opportunities pertaining to the different phases of the adaptation process were identified. Three of those barriers (i.e. competing priorities, existing management context and existing ecological context) are our additions to the initial list of common barriers proposed in the diagnostic framework. Barriers pertaining to the understanding phase were the most frequently noted by respondents. The understanding phase was also one which most of the barriers were nevertheless considered as opportunities. Emerging critical barriers and/or opportunities for climate change adaptation included perception of signal, availability and accessibility of information, existing management context and leadership. We propose that addressing these barriers and opportunities would involve improving perception about climate change and availability and accessibility of information, fostering anticipatory planned adaptation through the existing management context and developing leadership for adaptation. Findings from this study may prove useful to other jurisdictions, particularly those where climate adaptation is at its early stages of development.

This study addresses risk, vulnerability, and their implications for the adaptation of communities to the problems they face in the everyday life and to those derived from climate change. Based on the literature about risk, vulnerability and adaptation to disasters and on a case study conducted in the Northern coast of São Paulo - Brazil, we summarize the converging themes in the analysis of vulnerability and adaptation to climate change, which are divided in three components: (i) interdisciplinarity for studies about environment and society, requiring multiscale analysis, (ii) the integration of land use management instruments, and (iii) risk governance and communication. Based on the results of a risk perception survey (914 interviewees), we analyze vulnerability according to three interconnected axes (physical risk, social vulnerability and protagonism) by emphasizing the role played by the population in face of physical risk situations, as a way to guide integrated and participatory work efforts to encourage the engagement of the population to cope with and reduce the risks derived from historical and recurrent problems - such as poverty, social and spatial segregation - or with those that are about to come, such as climate changes.

This work addresses the relationships between Land Use/Land Cover (LULC) and water quality in the Paraíba do Sul River (PSR), located in one of the most populated regions in Brazil. We conducted a water sampling program (analyzing nitrate, ammonium, phosphate, turbidity, total carbon, oxygen concentration, and conductivity) during a severe drought period from 2014 to 2016. The 210 samples were spaced about 5 km apart from headwaters to the Atlantic Ocean and taken over 63 d. We calculated a water quality index and applied a self‐organizing map (SOM) to explore the relationship between LULC and water quality. There was a significant influence on water quality from the urban area's socioeconomic profile. This observation reflects the influence of cities with a high population density and a low economic condition, which leads to further degradation and erosion of the riverbanks. The most degraded reservoir of the PSR (Funil) partially buffers these effects by retaining deposited sediments and nutrient loads, leading to downstream water quality improvement. Better management practices of the riverbanks in the lower reach contribute to additional water quality improvements. Three major clusters identified using the SOM had completely different and explainable water quality patterns, suggesting an abrupt change in water quality due to human interventions. This information is crucial to improve management projects for the river at a watershed level, and with the expectation of future water shortages.