The coastal communities face Seawater intrusion as a permanent issue in their areas. This intrusion of seawater has the strength of degrading natural resources. Consequently, this disturbance of seawater intrusion affects the lifestyles and the livelihood of the communities living in the coastal regions (Magsi & Sheikh, 2017). Pakistan's coastline area is spread on 1050 km and further divided between the provinces of Sindh and Baluchistan along the Arabian Sea. Including Indus Delta, the coastline area of the province of Sindh is stretched on 350 km along with districts of Thatta, Sujawal and Badin (Majeed et al. 2010). There are several countries in the world thatare under the threat of devastating effects of climate change, including Pakistan (Pachauri et al., 2014).Global weather is highly affected by climate change and resulting in extreme floods, droughts, and seawater intrusion in coastal areas (Pasquier et al., 2020). Coastal communities of Sindh have been influenced by broadened rising sea levels bringing about loss of land and business. Environment-related catastrophes have brought about broad pressure and many socioeconomic losses with impacts on lifestyle, livelihood, agriculture, education and health of the local coastal communities in Sindh province in Pakistan. Indus River, which was the lifesaver of agriculture and fisheries in the Delta area, currently contributes some portion of the verifiable and fresh sediment waters in the Arabian Sea. Water extraction at the source through a progression of dams and channels remarkably lower downed water flow from the Kotri downstream. The absence of freshwater has significantly affected the Deltas ecosystem and sources of livelihood. It has been estimated that about 1.2 million hectares of fertile land have become either eroded or uncultivable due to the rising of seawater (Khan et al., 2002). According to Chandio et al. (2011), as per the survey by the Board of Revenue, more than 1,200 000 land in acres of the Indus delta is under danger of water intrusion. The districts of Sindh Badin and Thatta are major victims of this effect. Their eight sub-divisions along the coastline belt are almost in complete danger. In the current situation, the fertile land of these both districts have been affected due to the seawater erosion is about 550,000.

The areas at the coastline are considered significant economic zones, and socioeconomic activities along these are concentrated in high proportions. The seawater intrusion has strongly influenced the communities living in the belt of the coastline. Over the last fifty years, due to climate change, cyclones have been frequently occurred with greater intensity and caused enough economic consequences over the coastal belt of Sindh, including Karachi, Badin and Thatta districts. Climate change in this perspective has cost about $14bn per year, and the same loss is equal to the 5% GDP of Pakistan. So, these never-ending losses owing to the seawater rise will impact further the weak coastal economy (Memon, 2016). About 10% population of Pakistan is living in the neighborhood coastal zone. While in terms of development, over 20% of this population is relatively developed, and about 40% of the industry is also found near or on the coast of Pakistan. Suppose a sudden climate change will occur. This will become difficult to save this important population (Rabbani et al., 2008).

The study aims to know:

Previous studies conducted in different countries have highlighted various problems faced by coastal communities due to rising sea levels and seawater intrusion. One study conducted in Vietnam reported land loss, flooding in the coastal area and high intensity of coastal erosion due to the rising sea levels in the country (Nguyen, 2021). Another study conducted in Bangladesh noted severe impacts of seawater intrusion like increasing salinity in soils and decreasing livelihood sources of the coastal community (Waqas et al., 2021).

In this context, seawater intrusion is a serious problem worldwide, which has been linked with the climate change phenomenon in the world. The agriculture and fishing sectors are highly affected due to seawater intrusion, variability in downstream river flows, shortened rainfalls and other environmental factors (Mansur et al., 2005). Socioeconomic improvement is fundamental for development, but unfortunately, this area has been neglected by the governments, especially in the climate hit areas (Hasan, 2009). Socioeconomic indicators of health, education and other public facilities are highly affected due to climate change (Bradley & Corwyn, 2002). Coastal communities or either connected with agriculture or fishing are highly vulnerable to climate change threats, including sea rise levels and seawater intrusion in the region (Salik et al., 2015). It seems very clear that any profound change in the climate across the world will impact local agriculture, and eventually, the supply of food will be affected. The issue of predicting the future course of agriculture in a changing world is the hot topic of debate among scholars, which may affect the food demand and supply in the world (Abildtrup et al., 2006). Change of climate is a major danger to farm produce in the climate-vulnerable states of the world. One study has anticipated the effects of change climate on the produce of eight noteworthy harvests in Africa and South Asia through precise assessment and meta-investigation of information in 52 unique productions. The results of this study revealed that the anticipated mean alteration in the harvest of all products would decrease by the mid of 21st century. Verification of item yield influence in South Asia is a lot more grounded for sorghum, maize, wheat, and millet (Knox et al., 2012).Due to the rise of the sea level, the salinity has been increased, and mangrove forests have been declined, which has resulted in low activity for fishing in the affected areas (Mendenhall et al., 2020).

Perception, examinations and also the reproduction models show that environmental change would bring about changes in fundamental effectiveness, moves in transport and changes in the possible amount of excessively fished marine species, achieving consequences for the economic terms of fisheries all throughout the world. Despite the gaps in understanding environmental change ramifications for fisheries, there is satisfactory logical information that includes the need to execute climate change control and essential adaption to restrict the effects on fisheries (Sumaila et al., 2011). There are solid interrelations between fishing and climate change since fishing diminishes the age, measure, and geographic variety of humans, including the biodiversity of marine biological systems, making both progressively delicate to extra pressure as climate change. Inland fisheries are furthermore compromised by changes in rainfall and water availability. The recurrence and force of outrageous climate events are probably going to have a major effect on the production of fisheries in future in both the inland and marine fishing systems. Decreasing fishing death in the dominant part of fisheries, the same is right now completely misused or overexploited, are the main practical methods for lessening the effects of climate change overfishing (Brander, 2007). Although the exact effects and bearing of climate‐driven change for specific fisheries and fish stocks are questionable, there is visible economic stress or poor opportunities for development in countries that rely on fisheries (Allison et al., 2009). Fisheries will likewise be presented to a differing scope of immediate climate effects, comprising removal and movement of human populations and settlements; effects on coastal communities because of sea-level increase; and changes in the recurrence, circulation, or force of storms (Daw et al., 2009).

Another source of livelihood in the coastal region is livestock business. The interrelation of environmental change and animals is relatively an ignored area of research. Very small is available regarding the interrelation of climate change and increase variants in a climate with different drivers of development in livestock systems. In enormous areas in the subtropics and tropics, the rural livestock rearing systems are in rapid variation, the spatial heterogeneity of family unit reaction to change might be huge. Whereas, options may occur for a few family units to take benefit from increasingly favorable rangeland and farming conditions. Now it has been observed that climate change has a significant impact on livestock production and livestock systems in the emerging world (Thornton et al., 2009).

Uncertainties in climate also have endangered the agriculture production in the coastal areas of Pakistan as one of the studies noted adverse effects of climate change on cereal crops such as Maize (Mahmuduzzaman et al., 2014). Data from one study in this regard show more facts about the socioeconomic status of the people in the Indus delta region due to seawater intrusion. It was observed that 52% of the members of the coastal communities in the two districts of Thatta and Badin have lost. Hajamro Creek near Keti Bandar has erupted because of the absence of freshwater availability in the Indus River area under the risk of erosion. Keti Bandar generally used to be a port, yet because man-made activities are limited to be just fishing. If the immediate steps are not taken, time is not far away that locals of the Hajamro Creek must migrate to some other location (Memon, 2005). In the current scenario, countries like Pakistan are more subject to the impacts of the change of climate. The agriculture sector contributes 45% of the total employment in Pakistan, and climate change effects are very much visible in this sector. These are the major sources of livelihood in rural coastal communities, which might be at larger risk due to the change of climate, as observed in one of the studies conducted in the Indus Basin of southern Punjab (Qazlbash et al., 2021). Despite these few studies conducted in Pakistan, there is rare information available on the effects of seawater intrusion on the life of people in the Indus delta region at the Arabian sea. The results of this study will help in understanding the current situation of the problem and the socioeconomic status of the coastal communities in the region.

This is a socio-economic study conducted on the participants living in the coastal belt of the Badin and Thatta districts of Sindh province. Multistage sampling was used in the study to select the study participants. In the initial stage randomly 20 villages were selected of 8 dehs in one each Union Council of district Badin and Thatta. Later 200 participants were recruited in the study for data collection. The survey questionnaire was used, and questions were asked from the heads of the families to find out the economic effect of climate change and assert the impact of seawater intrusion on the life of people of coastal communities of Sindh, Pakistan.

Data for this study have been analyzed using software SPSS (Statistical Tools for Social Sciences) version 22. Firstly, the data have been analyzed descriptively with an objective of knowing the frequency and the percentage of the responses as obtained from the participants. Thereafter, the Multiple Regression Model was applied to know the economic effects of Seawater intrusion on life of Coastal Communities in the Sindh region of Pakistan in terms of income, decrease in sources of livelihood, decrease in cultivated land, livestock and fishing quantity.

This study has observed the significant relationship between seawater intrusion and adverse economic conditions for coastal communities in Sindh, Pakistan. It has been noted that the main livelihood sources of people like agriculture, livestock and fishing are affected. The majority of the respondents have lost their agricultural land due to seawater intrusion. People have reported a decrease in the number of livestock and low fishing in the study area. This was a socioeconomic study, so we had limitations in measuring environmental changes in the area. In this context, this study recommends more environmental studies to assess the depth of the problem in the Indus delta area and know the actual intensity of climate-related changes. Furthermore, it suggests government authorities and other stakeholders take essential measures for the socio-economic development of the coastal communities, including development projects, employment opportunities and adoptive strategies to cope up with the current situation.