Municipal Solid Waste (MSW) management is an essential service for an urban population to maintain sanitation. Managing MSW is complex as the treatment/recovery options depend not only on the volume of waste, but also on the socioeconomic conditions of the population. This paper focusses on MSW management in the Latin American and Caribbean (LAC) countries. Dominance of uncontrolled disposal options of MSW in the region, such as open dumps, has an adverse influence on health and sanitation. Interest in source separation practices and recycling is low in the LAC region. Furthermore, economic matters such as poor financial planning and ineffective billing systems also hinder service sustainability. Rapid urbanization is another characteristic feature in the region. The large urban centres that accommodate over 80% of the region’s population pose their own challenges to MSW management. However, the same large volume of MSW generated can become a steady supply of resources, if recovery options are prioritized. Governance is one aspect that binds many activities and stakeholders involved in MSW management. This manuscript describes how we may look at MSW management in LAC from the governance perspective. The issues, as well as the best potential solutions, are both described within three categories of governance: bureaucratic, market, and network. The governance perspective can assist by explaining which stakeholders are involved and who should be responsible for what. Financial issues are the major setbacks observed in the bureaucratic governance institutions that can be reversed with better billing strategies. MSW is still not seen by the private sector as a place to make investments, perhaps due to the negative social attitude associated with waste. The market governance aspects may help increase the efficiency and profitability of the MSW market. Private sector initiatives such as cost-effective microenterprises should be encouraged and the projects that fit under the Clean Development Mechanism (CDM) defined in the Kyoto Protocol should be incentivized to attract technology and capital. Lastly, network governance is at the centre of attention due to its flexibility in supporting/absorbing public-private partnerships, especially the participation of the informal sector that is important to the LAC region. Many individual waste pickers are providing their services to the LAC region by taking part in collecting and recycling under very unfavourable working conditions.

Wastewater management in Latin America faces great challenges to reach a sustainable state. Although enough infrastructure has been built to treat around 40% of wastewater, only between 15–20% is effectively treated, and abandoned or defective infrastructure is a common sight. Data about current conditions at specific sites is quite fragmented, when existing. This leads to challenges in management, decision making and planning for sustainable options. We argue that a main obstacle is the lack of a regionally relevant sustainability assessment framework that allows for a holistic understanding of wastewater management as a nexus problem. We therefore developed a comprehensive framework to (1) understand current conditions (2) involve stakeholders and (3) point to pathways to improve wastewater management in the Americas. Building on literature review and stakeholder involvement, we constructed a multi-scalar extended dataset framework that is adaptable to different study sites using specific criteria. Sustainability was assessed through a “distance-to-target” approach. Social and economic variables were the lowest ranking in both cases, with technical variables generally performing better. Although some dimensions of sustainability are performing acceptably, others, such as social and economic, are general low to very low performing. This means, when looked at in an integrated manner, neither of the wastewater management systems analysed can be considered sustainable. Here we present the approach itself, the results of its application in two pilot sites in Latin America, and our recommendation to shift waste water management into sustainability.

Although river water quality monitoring (WQM) networks play an important role in water management, their effectiveness is rarely evaluated. This study aims to evaluate and optimize water quality variables and monitoring sites to explain the spatial and temporal variation of water quality in rivers, using principal component analysis (PCA). A complex water quality dataset from the Freiberger Mulde (FM) river basin in Saxony, Germany was analyzed that included 23 water quality (WQ) parameters monitored at 151 monitoring sites from 2006 to 2016. The subsequent results showed that the water quality of the FM river basin is mainly impacted by weathering processes, historical mining and industrial activities, agriculture, and municipal discharges. The monitoring of 14 critical parameters including boron, calcium, chloride, potassium, sulphate, total inorganic carbon, fluoride, arsenic, zinc, nickel, temperature, oxygen, total organic carbon, and manganese could explain 75.1% of water quality variability. Both sampling locations and time periods were observed, with the resulting mineral contents varying between locations and the organic and oxygen content differing depending on the time period that was monitored. The monitoring sites that were deemed particularly critical were located in the vicinity of the city of Freiberg; the results for the individual months of July and September were determined to be the most significant. In terms of cost-effectiveness, monitoring more parameters at fewer sites would be a more economical approach than the opposite practice. This study illustrates a simple yet reliable approach to support water managers in identifying the optimum monitoring strategies based on the existing monitoring data, when there is a need to reduce the monitoring costs.

This paper provides a non-exhaustive overview of the main policies of the European Green Deal from the perspective of the water, energy and food Nexus, seeking for correlations, developments, actions and commandments that are intended to fulfil the prognoses designed by the Agreement., It covers the main public policies being implemented in the fields of water, energy and food in order to address any interlinkages among the policies already applied under a Nexus approach. The paper also points out some considerations over the European Union’s legal framework into the Nexus for water-related challenges’ perspectives. The goal is to facilitate the collaboration with stakeholders to gain deeper insights into how the interconnected relationship between water, energy, and food promotes policy alignment in the realms of these resources, facilitating Europe's shift towards a circular and eco-friendly economy.

The Water-Energy-Food-Ecosystems (WEFE) nexus presents a complex web of interactions, capturing the attention of both academia and policymakers. Sectoral policies wield significant impacts across WEFE domains, necessitating a nuanced approach to sustainability initiatives. For a decade, research and policy discussions across Europe have sought to comprehend these interconnections and develop strategies that minimize unintended consequences while maximizing co-benefits. The NEXUSNET Regional Forum convened in Split, Croatia on September 28, 2023, spotlighting stakeholders-practitioners who shape and are shaped by the WEFE nexus. With a focus on Southern Europe, the forum delved into challenges and opportunities, fostering the exchange of experiences and mutual learning among practitioners and policymakers. Diverse organizations were represented by esteemed panelists contributing to a comprehensive exploration of the WEFE nexus. The forum unfolded across three sessions: “Sectoral perspective viewpoint”, “Implementation of nexus cases”, and “Bridging the gap between nexus research and policy”. This paper distills the outcomes, providing a synthesis that transcends individual sessions. It offers a cohesive overview of the forum’s rich discussions, emphasizing the collaborative efforts required to navigate the intricacies of the WEFE nexus and elevate its societal and policy impact.