Elements of the water - food - environment nexus for integrated sustainability analysis.

Water and food security are constantly on the sustainable development agenda since they are interrelated with anthropogenic and ecosystemic issues present in the economic, environmental, and social spheres. The non-integrative management of these issues points to unsustainable futures. In this context, nexus approaches deserve considerable attention in the search for integrative management solutions capable of contributing to leveraging synergies that increase agricultural productivity, while simultaneously reducing environmental impacts, including water resources. This systematic literature review article aims to analyze the integration factors from the perspective of the water - food - environment nexus in the context of water and agricultural sustainability. The systematic methodology, including a content analysis, allowed the identification of analytical categories composed of the most present integrating factors and discussed in the scientific scope and how they are correlated from the perspective of the nexus. Among the extensive number of factors, the systemic management inserted in the integrated management of watersheds, the sustainable intensification from the perspective of food security and the demand for water resources, categorized in water security, presented higher frequency of occurrence when compared with the other factors. It is proposed that these factors can be considered as indicators of sustainability in the context of integrated water resources management and agricultural food production, since their synergistic effects have consequences in the water, agricultural and environmental management sectors. Thus, this study stands out for identifying trends and gaps in the water - food - environment nexus that can contribute to the development of innovative decision-making tools, in order to assist in the management of the watershed, where agriculture plays a key role in socio-environmental issues.