The article examines to what extent the adverse effects of climate change can be considered triggering factors of public insecurity. Against this background, it explores the growing environmental conflicts involving water resources in Brazil, including the Amazon region. In addition to the introduction and conclusion, the paper is structured around three topics. The first one outlines how the concept of public security has evolved to the present state, in which climate change is taken into account. Next, climate change is discussed as a factor that magnifies vulnerabilities, an argument supported by a discussion of historical events. The third topic highlights the main threats, vulnerabilities and conflicts involving water resources in Brazil, taking a scientific view of systemic risks and precaution. Finally, we propose rethinking the concept of public security in Brazil from a perspective of parameters involving regulations, principles and state initiative. The article suggests that the immediate and future effects of climate change do have a profound impact on social systems and on the environment, and may be a triggering factor of public insecurity. If institutions and governments do not address existing effects, and invest in adaptations to meet future scientific forecasts on climate change, social stability and the development of a culture of peace will be less likely in Brazil. A fundamental step in this process is the reformulation of the conventional concept of public security in the Brazilian legislation, in order to expressly incorporate the variable of climate security among its stated objectives. In addition, we point out a set of actions and principles with the potentital to promote not only adaptation and resilience, but also contribute to building peace. In terms of methodology, the study is descriptive, exploratory, legislative, bibliographical and documentary.
