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Salinity is one of the major problems in the coastal region of Bangladesh that contributes to 20% of the total land area. About 53% of the coastal region is affected by different degrees of salinity. Salinity intrusion in this area is mainly derived through climate change as well as anthropogenic factors that make this region more vulnerable. Hence, salinity intrusion has adverse effects on water, soils, agriculture, fisheries, ecosystem, and livelihoods of this region. To ensure the availability of food as well as drinking water, this chapter highlights how individual and community people have endeavored several adaptation measures to minimize salinity effects. Moreover, it further discloses governmental and other development organizations’ actions toward salinity to reduce its impacts.

This chapter provides a brief overview of our understanding of major public health challenges and environmental concerns in Karakalpakstan today, and highlights questions that still remain unanswered. As seen in the case of Muynak, the fishing town on the southern edge of the former Aral Sea, ecological disasters do not happen alone – they spur socioeconomic disasters that only heighten the health disasters. The loss of the sea, the loss of local livelihoods, and mass out-migration of the population, along with economic depression following the collapse of the Soviet Union, have adversely affected the community living in Muynak. They face major public health challenges, such as tuberculosis, multidrug resistant tuberculosis, and anemia as a result of their impoverishment. The desiccation of the Aral Sea is but one of the many disasters linked to intensive cotton cultivation in Uzbekistan. Pesticide contamination and the salinization of drinking water in Karakalpakstan are yet other environmental disasters that further threaten the health of the population and of future generations. Currently, there is an urgent need for greater international involvement and collaboration with Uzbeks to reverse the poor public health trends and to study the extent of environmental contamination in communities across Karakalpakstan, in order to reduce the health threats presented by these.

The southwest coastal region is part of an inactive delta of large Himalayan rivers and is protected from tidal surge by the Sundarbans mangrove forest. This area is the hub of all types of disasters such as cyclones, tidal surges, floods, drought, salinity intrusions, repeated waterlogging, and land subsidence. Cyclonic tidal surges and floods are the more common disasters, and their effects are frequently experienced at the local level. But silent and invisible disasters such as increased salinity, arsenic contamination, and drought affect local livelihoods, people, and environments in this region. The vulnerability of southwest region to increased salinity, arsenic contamination, and drought are the result of a complex interrelationship among biophysical, social, economical, and technological characteristics of the country. Moreover, in the current and foreseeable future, the country is likely to be affected by the biggest, most long-lasting, and global scale but silent disaster: increased salinity, natural arsenic contamination, and drought. Therefore, this region is thought to be the most disaster-prone region in Bangladesh because of natural disasters and highly vulnerable to the effects of climate change.

The main aim of this study is to investigate the impact of climate change and water salinity on farmer’s income risk with future outlook mitigation. Salinity and climate change are a threat to agricultural productivity worldwide. However, the combined effects of climate change and salinity impacts on farmers' income are not well understood, particularly in developing countries.

The response-yield function and general maximum entropy methods were used to predict the impact of temperature, precipitation and salinity on crop yield. The target minimization of total absolute deviations (MOTAD)-positive mathematical programming model was used to simulate the impact of climate change and salinity on socioeconomic and environmental indicators. In the end, a multicriteria decision-making model was used, aiming at the selection of suitable climate scenarios.

The results revealed that precipitation shows a significantly decreasing trend, while temperature and groundwater salinity (EC) illustrate a significantly increasing trend. Climate change and EC negatively impact the farmer's income and water shadow prices. Maximum reduction in income and water shadow prices was observed for A2 scenario (−12.4% and 19.4%) during 2050. The environmental index was the most important, with priority of 43.4% compared to socioeconomic indicators. Subindex amount of water used was also significant in study area, with 28.1% priority. The technique for order preference by similarity to ideal solution ranking system found that B1 was the best climatic scenario for adopting climate change adaptation in the research region.

In this study, farmers' income threats were assessed with the aspects of different climate scenario (A1, A1B and B1) over the horizons of 2030, 2040 and 2050 and three different indicators (economic, social and environmental) in Northwestern region of Pakistan. Only in arid and semiarid regions has climate change raised temperature and reduced rainfall, which are preliminary symptoms of growing salinity.

The Indus, Mekong, and Ganges River deltas, which have created one of the world’s largest delta and submarine fan system, currently contribute a major fraction of freshwater to East and South Asia. All these deltas are those regions in the world that face major challenges in their water sector due to population growth, urbanization, industrialization, sea-level rise, and salinity intrusion into inland and water bodies, all aggravated by climate change. Among them, salinity intrusion is currently one of the key issues that directly and indirectly cause water insecurity in East and South Asia, which ultimately hamper livelihood, agricultural production, and social interference. Hence, this chapter gives a comprehensive description on the nature and extent of the salinity problem, its adverse effects on livelihood and water sector, and then the focus goes to current and future sustainable water resource management within the delta to finally move on to conclusion and suggestions.

Groundwater resources are the primary source of meeting the water demand in Bangladesh. In rural areas, hand-pumped tube wells have been the primary source of drinking water. Though studies claim that Bangladesh has the potential to achieve universal safe drinking water supply coverage, the presence of excessive arsenic in the shallow groundwater sources, and the encroachment of salinity in the coastal aquifers in coastal regions (Satkhira, Khulna, Bagerhat, Patuakhali, Jhalakathi, Pirojpur, Barisal, Barguna etc.) hind the path. The concerned authorities of government and other non-government organizations assist the coastal people with alternative technologies like Desalination Plant, Arsenic-Iron Removal Plant, Pond Sand Filtration (PSF), Managed Aquifer Recharge, Rainwater Harvesting System, Installation of Shallow, and Deep Tube Wells. But based on case studies and surveys, this article shows how these existing technologies fail to ensure water safety within the coastal areas. The Singaporean water management policy is an example, this article advocates for necessary government intervention to ensure safe drinking water in coastal areas.

Water quality and quantity will become the principal limiting factor for sustainable development in many countries across the world. “Everything living is created from water” is an ancient quotation, which closely describes the importance of water. Water insecurity is a social dilemma in the recent decades because of several factors. Moreover, the widespread presence of arsenic in groundwater, salinity in both surface and groundwater, and the insidious disaster of drought make the water insecure and the population faces water risk in their daily life. Safe drinking water as well as health problems is an issue of concern in many countries on all continents, particularly in Southeast and South Asia. Therefore, this chapter provides water insecurity issues in a broader viewpoint especially focusing on salinity, arsenic, and drought disaster that together enhance vulnerability of water sector.

This paper aims to examine the issues of environment and climate change policy gaps and their impacts on the natural resources and ecosystems in southwest coastal Bangladesh. The effects of the increasing human activities as well as natural disasters due to the environment and climate change are analysed. The policy options as a response to mitigation, adaptation and possible human suffering as consequences are explored through discourse analysis.

This study applied focus group discussions, workshop and field visits to collect the data and information to explore environment and climate change policy-related problems.

It was found that there is a need for major policy reform to guide development interventions to reverse salinity, waterlogging, migration and groundwater recharging problems for sustainable environmental and ecosystem management in the region.

The paper then underscores the need for governments at all levels to adequately fund geo-information-based development interventions as adequate and proactive responses to environmental management and development to combat future environmental and climate change problems in the region.

Salt‐water intrusion has always been a source of contamination in coastal aquifers that hinders sustainable groundwater development. Classical techniques to detect its occurrence are costly and time consuming. The application of combined geo‐electrical and hydro‐chemical methods is cheaper, executable in reasonable time, and successfully applied in mapping the interface between saline and fresh groundwater. The current study aims at detecting and delineating salt‐water intrusion in the downstream part of Wadi Gizan in southwest Saudi Arabia using geo‐electrical and hydro‐chemical methods.

The case study area is the downstream part of Wadi Gizan in southwestern Saudi Arabia. Geo‐electrical data were obtained from field measurements using both Shlumberger and Wenner procedures. A number of 65 groundwater samples were collected and analysed for its total dissolved solids and major ionic composition.

The results show variations in the resistivity of the water‐bearing strata in the study area. Resistivity values decrease towards the Red Sea, and, in separate pockets. The total dissolved solids (TDS) and chloride distributions show the same pattern. Overlapping the areal distributions of the resistivity, TDS, and chloride concentration yield a map showing the limits of salt‐water intrusion and up‐coning pockets of saline water.

Planners, decision makers and other interest groups can use these findings for a sustainable groundwater development in the study area, and, to safeguard the aquifer from further advancement of salt‐water intrusion.

The case study indicates the importance of applying combined geo‐electrical and hydro‐chemical methods for groundwater quality variations and especially in detecting and delineating the contact between saline and fresh groundwater in coastal aquifers.

Water is a basic human need, a finite life support system and a key to prosperity. Unplanned industrialisation, urbanisation and impact of liberalised import of wastes intended for recycling have negatively affected the water environments in India. This is further exaggerated by lack of discipline and a weak obligation towards conservation and pollution prevention. Measures have to be especially taken to resolve the groundwater problems. While groundwater resources are quite well assessed, overexploitation still occurs frequently. There has been a considerable lack in implementing existing policies as well as developing new laws and policies. To mitigate the problems, co‐operation needs to be mobilised at all levels of the federal set up with the stakeholders and the people at the lowest appropriate level concerning planning and decision making. Water must be considered as a national asset and a basic human right to be provided to citizens in proper quantity and safe quality with equity and fairness amongst the users.