This collection seeks research or review papers on WEFE Nexus approaches in water management, aiming to enhance resilience and sustainability. Globally, many regions face increasing pressures on water resources due to climate change, population growth, and intensive human activities. These factors often lead to conflicts and inadequate mitigation measures, exacerbated by insufficient data. Unsustainable water management practices strain resources, leading to wastage, declining aquifer levels, and environmental degradation. Addressing these challenges requires an integrated approach, considering economic, social, and environmental factors. Solutions must adopt a holistic approach to the WEFE interplay to achieve impact, with a pragmatic consideration of financial feasibility, economic return, sustainable resource use, and social acceptance.

Potential scientific topics for submitted papers may include:

• Analysis of governance structures and policy frameworks for integrated management of water, energy, food, and ecosystem services.

• Investigation of the unique challenges and strategies for managing the WEFE Nexus in urban environments, including water supply, energy demands, food security, and ecosystem preservation.

• Assessment of climate change impact on water resources, energy production, food security, and ecosystem services, and exploration of potential adaptation and resilience strategies for the WEFE Nexus.

• Strategies and measures for safeguarding access, fairness, and equity in resource allocation towards WEFE Nexus security.

• Circular economy and zero waste approaches to optimize resource use and minimize waste within the WEFE Nexus, including water reuse, energy recovery, and food waste reduction.

• Interactions between water, energy, food, and ecosystem services and their impacts on biodiversity, ecosystem health, and ecological balance.

• Local/regional community engagement and participation of stakeholders in WEFE Nexus management, including case studies of successful community-led initiatives.

• Analysis of international and transboundary challenges in managing the WEFE Nexus, including geopolitical conflicts over shared water resources and opportunities for cooperation.

• Investigation of technological innovations such as sensor networks, data analytics, and precision agriculture for optimizing resource use and enhancing efficiency within the WEFE Nexus.

• Assessment of the economic value of ecosystem services provided by water resources, such as water purification, flood regulation, and habitat provision, and exploration of methods for incorporating these values into decision-making processes.

Keywords: WEFE Nexus; water resources management; irrigation water; modelling; agroecology; environmental economics; stakeholder engagement; water conflict; hydro-diplomacy; ecosystem services; water governance.

This Collection supports and amplifies research related to SDG2 (Zero Hunger), SDG6 (Clean Water and Sanitation), SDG7 (Affordable and Clean Energy), SDG12 (Responsible Consumption and Production), SDG13 (Climate Action), and SDG15 (Life on Land).

Water, an essential element for all forms of life, acts as a crucial connector within the One Health framework. Recognizing the significance of water in the interplay between human, animal, and environmental health, this Collection delves into the intricate relationship between water and health. The focus is on the transformative approach of integrating water management and health policies under the "One-Water and One-Health" paradigm, with a particular emphasis on wastewater surveillance, reuse, and other comprehensive aspects.

Acknowledging the vital role of water ecosystems in the health of humans, animals, and plants, this Collection underscores the importance of water quality and management in disease prevention and health promotion. We explore how water serves as a conduit for pathogens, including zoonotic diseases, and how the degradation of aquatic ecosystems has repercussions for biodiversity and public health. This collection of articles aims to highlight the need for a unified approach to water and health, transcending traditional sectorial boundaries.

This Collection aims to serve as a catalyst for discussion and action among policymakers, scientists, and practitioners. By presenting evidence-based research and case studies, we endeavor to support the development of integrated strategies that prioritize the sustainable management of water resources in alignment with the One Health approach. Through collaborative efforts and innovative solutions, we can better protect and promote the health of all species and the environment, ensuring a sustainable and healthy future for generations to come.

Main Topics of the Collection:

• The Role of Water in One Health: We examine water as a vector for zoonotic diseases and its impact on public health, emphasizing the need for maintaining water quality and conserving aquatic biodiversity as part of a holistic health strategy.

• Water-Cycle Based Epidemiology and Wastewater Surveillance: This section delves into the flow of pathogens through the water cycle, the monitoring of antimicrobial resistance (AMR), and the integration of environmental data for outbreak prediction. It showcases the advancements in wastewater-based epidemiology (WBE) for public health monitoring and its potential in tracking infectious diseases like COVID-19, especially in low-resource settings.

• Sustainable Water Management and One Health: Articles here discuss best practices in water management within agricultural practices to minimize health risks, the implications of climate change on water resources, and the necessity for policies that ensure safe water across all sectors.

• Technological and Innovative Approaches: This segment highlights cutting-edge technologies for water purification, disease detection, and the utilization of big data and artificial intelligence (AI) in managing water-related health risks. It also explores the role of mobile health (mHealth) applications in water and health monitoring.

• Cross-Sectoral Collaboration and Policy Making: We address the challenges of cross-sectoral collaboration between water and health sectors, the role of international organizations in advocating for a One Health approach to water, and the development of a global framework for water and health governance.

Keywords: Water in One Health; Water-Cycle Based Epidemiology and Wastewater Surveillance; Sustainable Water Management and One Health; Technological and Innovative Approaches; Cross-Sectoral Collaboration and Policy Making.

This Collection supports and amplifies research related to SDG 3, SDG 6, SDG 11, SDG 14 and SDG 15.