Masters Degree. University of KwaZulu-Natal, Pietermaritzburg. | Urban farming, in its small scale comprises of various production systems and practices that can lead to poor soil conditions, water pollution and the extension of climate change impacts. Moreover, smallholder farmers are in turn challenged by climate change impacts including heavy rainfall, high temperatures, hailstorms and pests exacerbated by the lack of knowledge, institutional support, governance framework, limited financial resources and technology. As a result, farmers are vulnerable to urban farming and environmental risks that affect the farmers’ food and nutrition security. On the other hand, if done well, urban farming (UF) can benefit the urban environment through flood water mitigation, water infiltration and greening of the environment, while improving food security. The study was conducted in the communities of Sobantu, Sweetwaters and Mpophomeni, in KwaZulu-Natal. This study employed a mixedmethods research approach, which combines quantitative and qualitative analysis. The quantitative approach used a survey questionnaire to elicit responses from 78 urban and periurban smallholder farmers who were purposefully selected to participate in the study. Focus group discussions and field observations were used to collect in-depth qualitative data about the challenges urban farmers faced in urban farming. Additionally, the logit regression model was used to identify factors that influence the farmers adoption of urban farming management practices. The study revealed that the majority of the farmers were faced with environmental problems including poor soil conditions, water quality and access problems and climate change impacts, of which had an impact on crop yield and farm profit. Furthermore, results showed that 69.2% of farmers were aware of the environmental implications of urban farming. However, it was found that due to the farmers limited financial resources, farmers identified urban farming mainly as a source of income and a strategy to obtain extra food and less for the benefit of the environment. The study found that market availability (p=0.003), training on soil management (p=0.0011) and access to credit (p=0.097) were significant factors in the adoption of urban farming practices. The study further revealed that the farmers adoption of urban farming and water quality management practices were challenged by socio-economic and institutional factors such as the lack of knowledge, farmer training, access to markets, access to credit and poor extension support. An environmental management framework was provided to address the challenges that hinder the smallholder farmers adoption of urban farming and water quality management practices. | Authour's Keywords: urban farming, environmental management, food security, climate change impacts.

This thesis concerns with water, energy, and food (WEF) security in Nepal in relation to hydropower development. Hydropower is challenging to WEF security in three ways: First, the focus is only on energy generation which overlooks the impacts on land, forest, water and biodiversity. Second, the hydropowerprojects are being built in the tributaries of transboundary rivers where local, national and international interests and priorities intersect because these rivers are sources of the economy; water, energy, food commodities; and other ecosystems services. Third, discourses on renewable energy, sustainable development and climate change portray hydropower as a promising renewable energy source as other renewable energy sources hold very less potential in Nepal. In this context, this thesis evaluates if the benefit-sharing approach can be a solution to overcome problems related to the implementation of hydropower which challenges WEF security. Therefore, the study adoptsWEF Nexus Framework and Benefit-sharing Framework to evaluate the challenges and possibilities for rising WEF security minimizing the hydropower-induced trade-offs. The study finds hydropower development in Nepal is rapid and haphazard which merely conceives trade-offs between energy production and other benefits. But benefit-sharing practice, though it is still in its nascent phase, has positively impacted WEF security primarily at the local level, mainly by providing irrigation and drinking water facilities, rural electrification, and agriculture-related livelihood training and support. However, a well-planned benefit-sharing approach as an integral part of hydropower development is lacking which foils equitable distribution of benefits among stakeholders across all levels and smooth implementation o f hydropower projects to enhance the sustainability of hydropower.

In Africa, water resources pervade multiple sustainable development goals (SDGs), which mainly focus on eliminating poverty (SDG 1) and hunger (SDG 2), promoting good health and well-being (SDG 3) and supporting clean water and sanitation (SDG 6). Africa's water scarcity problems have been worsened by population growth and climate change. Agriculture is the largest consumer of water in Africa, and a clear understanding of the water-food nexus is necessary to effectively alleviate water-related pressures on food security. Water footprint (WF) accounts and decompositions provide insights into water management planning for policy-makers. We investigated the WF of food consumption from 2000 to 2018 in 23 African countries and used the logarithmic mean Divisia index (LMDI) to decompose its driving forces into consumption structure, per capita food consumption, water intensity and population effect. The WF of food consumption increased from 609.8 km³ in 2000 to 1212.9 km³ in 2018, with an average annual growth rate of 3.7%. The population effect contributed most to this change (64.6%), followed by per capita food consumption (28.3%) and consumption structure (7.1%). Cereals (46.7%) and livestock (24.4%) were the major contributors to the increase in the total WF. Our findings highlight that controlling population growth and improving water efficiency are effective measures to relieve water-related pressures on food consumption. However, a healthy dietary structure must also be promoted because Africa's current dietary energy level is below the global average. Moreover, nine countries in the research area have an inadequate supply of dietary energy; this will inevitably drive the WF of food, as calories increase and diets change. This study is helpful for understanding the water-food nexus in Africa and provides strategies to conserve water and enhance food production.

The occurrence of disease outbreaks involving low‐water‐activity (aw) foods has gained increased prominence due in part to the fact that reducing free water in these foods is normally a measure that controls the growth and multiplication of pathogenic microorganisms. Salmonella, one of the main bacteria involved in these outbreaks, represents a major public health problem worldwide and in Brazil, which highlights the importance of good manufacturing and handling practices for food quality. The virulence of this pathogen, associated with its high ability to persist in the environment, makes Salmonella one of the main challenges for the food industry. The objectives of this article are to present the general characteristics, virulence, thermoresistance, control, and relevance of Salmonella in foodborne diseases, and describe the so‐called low‐water‐activity foods and the salmonellosis outbreaks involving them.

Integrated rice–fish culture is a competitive alternative to rice monoculture for environmental sustainability and food productivity. Compared to rice monoculture, rearing fish in rice field ecosystems could increase food (rice and fish) production from this coculture. Moreover, the water productivity of rice–fish coculture is considerably higher than that of rice monoculture, because of double cropping. Despite these benefits, rice–fish coculture has not yet been broadly practiced. One of the potential challenges for the wider adoption of rice–fish coculture is water management. There are two forms of water involved in rice–fish cultivation: (1) blue water–surface and groundwater, and (2) green water–soil water from rainfall. The aim of this article is to focus on key factors determining the adoption of rice–fish cultivation through the effective utilization of blue–green water. We suggest that the efficient application of blue and green water in rice–fish coculture could help confronting water scarcity, reducing water footprint, and increasing water productivity.

Sector-based resource management approaches partly contribute to the insecurities in water, energy and food sectors and resources. These approaches fail to acknowledge and capture the interlinkages between these connected resources, a key strength in the water-energy-food (WEF) nexus approach. However, the multi-centric, multidimensional, and spatiotemporally dynamic WEF nexus is complex and uncertain, thus requiring dedicated tools that can unpack it. Various sources have blamed the slow uptake and practical implementation of the WEF nexus on the unavailability of appropriate tools and models. To confirm those claims with evidence, literature on WEF nexus tools was searched from Scopus and Web of Science and systematically reviewed using the PRISMA protocol. It was found that the WEF nexus tools are being developed increasingly, with a current cumulative number of at least 46 tools and models. However, their majority (61%) is unreachable to the intended users. Some available tools are in code format, which can undermine their applicability by users without programming skills. A good majority (70%) lack key capabilities such as geospatial features and transferability in spatial scale and geographic scope. Only 30% of the tools are applicable at local scales. In contrast, some tools are restricted in geographic scope and scale of application, for example, ANEMI 3 and WEF models for large and household scales, respectively. Most (61%) of the tools lack wide application in actual case studies; this was partly attributed to the tools not being readily available. Thus, efforts should be made to disseminate and ensure end-users’ uptake and application of developed tools. Alternatively, the user-friendly tools should be developed on-demand as requested and inspired by potential clients. Developers should consider utility, transferability and scalability across uses and users when improving existing tools and developing new tools so that they are adaptable, only requiring new, specific location-adapted inputs and data. Where and when it is necessary to capture spatial dynamics of the WEF nexus, tools should be geographic information system (GIS)-enabled for automatic WEF nexus location selection, geospatial mapping, and visualization. Such GIS-enabled WEF nexus tools can provide a bird’s eye view of hotspots and champions of WEF nexus practices.

Water–Energy–Food Nexus Narratives and Resource Securities: A Global South Perspective provides a knowledge synthesis on the water–energy–food (WEF) nexus, focusing primarily on the global south. By presenting concepts, analytical tools, and case studies, the book serves as a practical resource for researchers, policymakers, and practitioners in sustainability and functional roles across all three sectors. It addresses key issues related to data availability, tools, indices, metrics, and application across multiple scales, beginning with a summary of existing knowledge. Finally, it examines the WEF nexus, presents global insights, and discusses future considerations and implications. This book presents an overview of existing knowledge on the WEF nexus and examines how such research aligns with emerging global WEF nexus perspectives, making it ideal for professionals, government entities, private industry, and the general public.