**4.1 Agriculture and food security**

### *4.1.1 Vulnerabilities and impacts*

Farming and other rural livelihood activities in West Africa are highly vulnerable to the impacts of climate change. For instance, drought, floods, windstorms and epidemics have been identified as the main climate and environmental risks the people are exposed to in Burkina Faso, Niger, Ghana, Nigeria and Benin [26, 28–30]. Drought often causes widespread crop failures, particularly where rain-fed agriculture is the dominant farming practice. Furthermore, successive floods and drought greatly reduce the ability to store food for future use, with great negative impacts on food security [29]. Decrease in land productivity and crop yields has become a threat to the survival of large number of people and livelihoods in in the region. The environmental stressors like drought have combined with anthropogenic factors like destruction of forest cover and increasing use of intensive cultivation to result in decline in soil fertility and associated decline in ecological resilience [31].

For example, food insecurity was reported to be very high in northern Ghana, as 60% of the rural households have insufficient food during four months of the year. Furthermore, as a result of unpredictability of rainfall many farmers have experienced significant decrease in yields, and often find it difficult to know when to plant [26]. In Burkina Faso where agriculture employs almost 90% of the active population smallholder rain-fed agriculture is the mainstay of the economy, the country is also characterizes by chronic food insecurity with many households finding it difficult to satisfy their food needs [28, 29]. Similarly, in Niger the trend of increasing temperatures, decreasing rainfall coupled with increasing land degradation has emerged as the main challenge to agricultural productivity and food security. In addition, increasing population pressure has pushed agricultural expansion into marginal lands, further increasing environmental degradation [29, 32].

Most other countries in the sub-region also face similar situations. For example, Togo which has about 70% of the working population in agriculture is also highly vulnerable to natural disasters in the form of drought, flooding and windstorms. The country experienced three major droughts and eight major riverine flooding events from 1900 to 2020, with a combined total of over one million people affected


#### **Table 1.** *Natural disasters in Togo, 1900–2020.*

*Climate and Environmental Risk Action: A Call for Fresh Commitments to Adaptation… DOI: http://dx.doi.org/10.5772/intechopen.106428*

(**Table 1**). It is projected that increasing temperatures would affect productivity of key crops like coffee, cocoa and maize and also increase the prevalence of pest and diseases in the country. The last four decades in particular have witnessed many floods that have devastated large areas of cultivated lands [30].

#### *4.1.2 Adaptation and resilience options*

Some adaptation options for crop production include adoption and promotion of conservation agriculture, agroforestry, water management, cultivar development, fertilizer efficiency, changes in planting dates, restoration of degraded lands and seasonal weather and climate services [10, 33–36]. For instance, agroforestry (integrating trees with crops) has many advantages if carried out correctly. The trees serve as 'nutrient pumps' by helping to bring nutrients that are too deep for crops, while their leaves also serve as mulch that might suppress some weed growth and also protect the soil from intense heat. In addition, the litter will be transformed to organic matter while the trees also contribute to adaptation by helping to screen the crops from strong winds [35].

There is also a lot of potential for improving water management in form of irrigation and water harvesting. For instance, it has been estimated that out of the 75.5 million hectares of arable land available in the region, only 1.2% (917,000 ha) benefit from irrigation, while only 0.8% (635,000 ha) could be said to be under effective use [10]. However, it has been argued that it may be more beneficial to focus more on small scale private irrigation as against large scale public irrigation. This will ensure more efficient management and distribution of water [35, 36]. For example, farmermanaged irrigation in Mali and valley bottom irrigation in northern Nigeria and Niger have been found to very successful [37]. Great potential also exist for integrating aquaculture into irrigated plots so as to increase food production in the sub-region. For instance, many West African countries including Nigeria, Mali and Senegal among others have the essential resources required to produce large quantities of fish in irrigation schemes. In particular, rice-fish farming can be successfully adopted and implemented in many areas of West Africa [38–40]. There are also opportunities for the development and adoption of new varieties of cultivars. Introduction of varieties of cultivars that can withstand higher temperatures and varieties that are resilient to drought, pest, weeds, flooding and salinity will go a long way in ensuring higher adaptation and resilience to climate hazards.

Adoption of integrated soil fertility management, changing of planting dates and provision of seasonal weather and climates services are also important adaptation options. For instance, ensuring the application of the right type and quantity of fertilizer at the right time will guarantee efficient use by crops while minimizing emissions. Promotion of integrated soil fertility management will also ensure enhancement of soil organic matter and improve nutrient efficiency [35]. For example, adaptation options like late sowing, fertilizer use and increased planting density have been suggested for sorghum while promising effect of rainfall harvesting technique has been found in maize cultivation in West Africa [36]. Provision of weather and climate information services will raise adaptive capacity by helping farmers to plan their planting and make projection about rainfall distribution patterns and temperature variation. For instance, evidences from Ghana and Senegal have shown the importance of providing reliable information on weather and climate-smart agricultural practices through radio and mobile phone services to farmers [35].

#### **4.2 Water resources**

#### *4.2.1 Vulnerabilities and impacts*

Climate change, population pressure and economic development are posing major challenges to water resources management in West African countries. Inadequate access to water supply and frequent droughts and floods disrupts the livelihoods of the people. Flooding results in siltation and sedimentation of rivers and lakes, and pollution of surface waters. It may also create ecological condition for invasive species that may further change ecosystem structure and function. For instance, disruption of ecosystem structure may alter biological cycle of fish production in an area [41].

Droughts are associated with drying wells, fall in water body levels, rise in pollutant loads and general aggravation of water stress [29]. In the last five decades, West African rivers have experienced overall decline in water supply and it has been projected that river flows will decline by 20–40% by 2050 [29]. Reduced river flows are expected to encourage the spread of toxic water plants such as hyacinth. When this is combined with rising temperatures, it will cause further decline in water quality and encourage the spread of water borne diseases like malaria. Increased water stress will also aggravate other health conditions. For instance, diarrhoea is a major cause of childhood mortality in West Africa [30].

In addition, increase in water stress implies that people, particularly women and children would have to travel farther to access water for domestic uses, reducing their ability to engage in economic activities [29]. Already, three West African countries namely, Nigeria, Niger and Burkina Faso already belong to the group of 37 "hotspot" countries with largest number of children living in areas of high or extremely high water vulnerability [42]. Poor access to water normally increases vulnerability, considering the fact that access to water is essential for maintaining good health and the ability to cope with other stresses [31].

Along the coastal areas, rising sea levels and increasing sea surges will worsen the problems of salt water intrusion into inland freshwater bodies and may cause lakes and lagoons to become completely brackish, with serious negative implications on biodiversity, including mangrove population [29]. The importance of mangrove is such that it is known to buffer river basins and also protects water birds and river fish stock against ocean waves and saltwater invasion [41, 43]. For instance, in the


#### **Table 2.**

*Projected general impact of sea level rise by 2100 for selected West African countries.*

*Climate and Environmental Risk Action: A Call for Fresh Commitments to Adaptation… DOI: http://dx.doi.org/10.5772/intechopen.106428*

Niger Delta sea surges and flooding pollutes water aquifers and rivers with sediment [44], with great negative implications on human health and human livelihood. Furthermore, salt intrusion on arable land in coastal areas may lead to loss of productive land. It has also been associated with crop substitution and dependence on one crop as an adaptation measure as observed in Guinea Bissau, which created further food insecurity and made the people more vulnerable to price fluctuations [45]. Many West African countries are vulnerable to the risk posed by sea level rise. **Table 2** show the general impact of projected sea level rise by 2100 for some West African Countries.

Additionally, increase in water shortages will fuel conflicts among communities depending on shared water bodies. Conflict over water resources is already becoming a problem in many areas within the sub-region. For instance, the shrinking of Lake Chad by about 90% is viewed as a major factor in the persistent conflict and violent extremism in the area [46]. The lake is very vital to the economy of the area as the primary supplier of fresh water for bordering communities in Nigeria, Niger, Cameroon and Chad. Climate change has led to increasing competition for land resources in the area resulting in conflicts among communities. The persistent insurgency in area has been linked to failed harvests, loss of livelihood, food insecurity, forced migration and poverty brought about by increasing water stress in the area [7, 46].

#### *4.2.2 Adaptation and resilience options*

Human activities and their impacts on water scarcity must be fully considered in drought risk management and policy. For instance, while land degradation reduces soil water holding capacity and increases vulnerability to drought, rehabilitation of degraded lands and enhancement of soil health are known to help create better resilience to drought [37]. Water conservation and supplementation in dry areas, adoption of integrated water storage and small reservoir systems have been successfully implemented in Mali, Ghana and Burkina Faso to improve water supply for agriculture [35]. Furthermore, reforestation schemes in the savannah regions of West Africa have shown evidence of increased river flow and ground water recharge [31].

However, adoption and implementation of integrated water resources management is very vital in adaptation to climate change. This will enable the integration of all aspects of the water system (surface water, underground water, water quality and so on) with all water related sectors (flood control, irrigation, water supply, industrial water and so on) and water use and control practices, to secure quantity and quality of water required for modern society [47]. The success of this approach requires the collection and sharing of relevant water data on quantity of water resources and water allocation (water demand, water intake, seasonal water changes and so on). The implementation involves efficient use of water resources to reduce vulnerability to climate change impacts such as adoption of crops with low water requirements, promotion of water saving irrigation technology (such as drip irrigation), reducing water use and raising public awareness. It also involves promoting groundwater recharge, controlling exploitation, monitoring groundwater levels, conserving groundwater quality, enhancing other sources of water supply (like rainwater harvesting and waste water treatment) and promoting water storage by boosting capacity of water resources development facilities [47, 48].

#### **4.3 Human health**

#### *4.3.1 Vulnerabilities and impacts*

West African countries are characterised by inadequate health infrastructure, services and access to health care, which make public health highly vulnerable to adverse effect of climate change [9]. Many adverse implications are attributable to projected temperature increase, decreasing rainfall, increased frequency and intensity of tropical rainstorms and increased duration and severity of aridity and drought. Expected health implications will be linked to increased water stress, rise in food shortages, and increased exposure and proliferation of infectious and vector borne diseases and heat related diseases [30]. Temperature and rainfall trends are expected to result in shift in the distribution, timing and severity of climate sensitive diseases like malaria and meningitis [49]. Heat stress and other related risks associated with cardiovascular and respiratory diseases are also expected to be on the rise due to increased heat waves, with children and the elderly in particular more likely to be impacted. Evidences already exist related to rising mortality associated with increasing heat in countries like Burkina Faso and Ghana. Deterioration of air quality due to dust is will also worsen the problem of cardiovascular and respiratory diseases in the region, considering the fact that increase in dust during the harmattan has been observed in countries like Nigeria and Togo [30, 49]. For example, in Nigeria 50% of the deaths related to ischaemic heart diseases, stroke, lung cancer and chronic obstructive pulmonary diseases among adults, and acute lower respiratory infections in children below 5 years in 2012, were attributable to household air infection [50].

Increasing water scarcity will worsen the intensity and spread of waterborne and water wash diseases as people are forced to depend more on unsafe sources of water in the drier areas. Poor water quality is a major threat to human health in West Africa. For example, it has been observed that 34% of the population in the sub-region lack access to safe drinking water, while 73% lack access to basic sanitation [42, 49]. In addition, there is high possibility that the rate and distribution of vector and waterborne diseases will be worsened by the warming temperatures, more frequent intense tropical storms and flooding. Nigeria faces great inland flood risk and it is projected that by 2030 an additional 801,700 people may be at risk of river floods annually due to climate change [50]. For instance, recurrence of cholera and diarrheal diseases are closely linked to heavy rains and flooding which bring contaminated water and sewage into domestic water sources. Poor access to safe water, poor sanitation and hygiene have been associated with high rates of diseases like diarrhoea, pneumonia, trachoma and worm related illnesses [44, 49].

#### *4.3.2 Adaptation and resilience options*

Health adaptation options can be considered on a range of probable technological and behavioural changes such as improved surveillance of infectious epidemic diseases, early warning systems for human health, public health and environmental education, institutional coordination and disaster preparedness and so on [51]. A number of adaptation measures are already being implemented in West African countries. Evidences of implementation of health adaptation measures exist in Gambia, Nigeria

### *Climate and Environmental Risk Action: A Call for Fresh Commitments to Adaptation… DOI: http://dx.doi.org/10.5772/intechopen.106428*

Sierra Leone, Ghana and Guinea Bissau among others. For example Gambia is designing Geographic Information System (GIS) health data bases on several communicable diseases. These user friendly GIS data bases offer real time information and remote data on epidemiological diseases. The country also plans to implement vector control programmes through its proposed investment in public education, social mobilization and an array of preventive measures such as encouragement of use of insecticide treated nets and mosquito repellents [51].

Nigeria has an official National health adaptation strategy guiding the implementation of climate change adaptation in the health sector. Part of the actions being implemented include awareness programme concerning serious health issues that would enable community members to take pre-emptive actions against health challenges [50, 51]. The country is also strengthening its seasonal weather forecasting system through the provision of up to date information on extreme events like dry spells, heavy storms and heat waves, and providing health warnings through the analysis and integration of weather and health threshold data [51].

In Sierra Leone, community health education programmes are providing community health education to enable community members to identify and eliminate breeding sites of disease vectors. The country is also engaging community health workers and volunteers to educate the public in areas of stress management and improved community education in areas of food poisoning, personal hygiene and sanitation [51, 52]. Health sector specific messages, of Sierra Leone's climate change communication strategy under the National Adaptation Plan (NAP), are designed to help reduce health risk associated with climate change. For instance, to address the problem of increasing cases of disease outbreaks resulting from poor sanitation and hygiene, and warmer temperatures, emphasis was placed on educating the people on the need to eradicate vector breeding sites and encourage healthy living in safe environment, and the use of clean and safe water [5].

Ghana also has an official national health adaptation strategy which is guiding programmes' implementation on health adaptation to climate change. Various actions have been implemented, focused on building institutional and technical capacities to work on climate change. In addition, efforts have been directed towards incorporating climate information into integrated disease surveillance and response system, including the creation of early warning and response systems for climate related health risks. Furthermore, programmes have also been implemented to raise resilience of health infrastructure in the country [53].

Other opportunities for action in the sub-region have however been identified. For instance, in the case of Nigeria, WHO/UNFCCC emphasised the need for comprehensive health vulnerability and adaptation assessment incorporating relevant stakeholders from all sectors [50]. The organisations also called for the need to build up institutional and technical capacities in relation to climate change and health, and implementation of activities to increase climate resilience of health infrastructure. In Ghana, WHO/UNFCCC identified the urgent need to conduct a national assessment of climate change impact, vulnerability and adaptation for health in the country, and the need to work on estimating the cost of implementing health resilience to climate change [53]. Furthermore, it was noted that the country had no focal point for climate change in the ministry of health (which is very necessary for proper coordination of programmes and activities).

### **4.4 Energy**

#### *4.4.1 Vulnerabilities and impacts*

Increasing population, rapid urbanization and economic growth is pushing up the demand for power in West Africa. However, the sub-region falls within Sub-Saharan Africa which is regarded as the most electricity poor area in the world, where the average electricity rate is about 20%. It is projected that with the present population growth rate, about 500 million will be without electricity by 2040 [49, 54]. The severe shortage of energy has constituted a major constraint to livelihoods and economic development in West African countries. For instance, there is no access to electricity for 80% of the population in Niger, Liberia and Burkina Faso and for 40% in Nigeria (over 70 million) and Senegal [49]. Even for those that have grid connection, supply is grossly unreliable and people as a necessity most often rely on private generators, thereby incurring extra costs. Furthermore, it is observed that electricity tariffs in Africa are among the highest in the world [49, 54].

Millions of people in the sub-region still depend on the traditional use of solid biomass for cooking. Even some people who have access to electricity, liquefied petroleum gas (LPG), natural gas or biogas still continue to use biogas due to cultural or affordability reasons. For instance, Nigeria is included among the five countries (with Ethiopia, DR Congo, Tanzania and Kenya) that account for about half of the Sub-Saharan population using solid biomass for cooking. In the rural areas in particular, majority of households do not have access to clean cooking, they depend on fuel wood and often spend substantial part of the day collecting firewood [54].

The natural vegetation has been considerably destroyed or degraded by agricultural expansion and overexploitation for firewood, charcoal and timber. For instance the natural forest in West Africa has reduced by 37% and with even higher losses in countries like Nigeria, Ghana, Guinea and Sierra Leone [49]. Natural forests are expected to experience significant drop in productivity in the near future, due to rising temperatures and evaporation that will like lead to water balance deficits and reduced productivity in forest resources. The effect will be more in the savannah region which is already experiencing increasing scarcity of wood resources [5, 28–30].

However, more challenges for hydropower development in the sub-region have been projected. It is expected that increased evaporation due to rising temperature, more extreme rainfall events, decreased river flow in some areas, more dam construction and extensive land use changes would cause higher incidents of flood damage to dams, more reservoir evaporation and siltation and increase river flow variability [29, 49].

#### *4.4.2 Adaptation and resilience options*

While inadequate electricity constitutes a major constraint to development, more than 50% of West Africa's hydropower potential still remains untapped. Therefore, considering the large number of rivers that can be harnessed for generating electricity, there is still a lot of opportunity for further development of hydropower in the sub-region. There is also s great potential for solar energy and wind power in West Africa. Presently, solar energy plays a limited role in the power sector in Africa in general despite the fact that most parts of the continent enjoy an average of over 320 days/year of sunlight. Thus, potential power generation from solar energy is far greater than present electricity demands and even far into the future [55]. Wind

*Climate and Environmental Risk Action: A Call for Fresh Commitments to Adaptation… DOI: http://dx.doi.org/10.5772/intechopen.106428*

power development is also very limited in West Africa as in other parts of Sub-Saharan Africa, for which the potential is estimated at about 1300 GW. West Africa is considered as one of the areas where the greatest potential for wind power lies in Africa [55].

#### **4.5 Infrastructure**

#### *4.5.1 Vulnerabilities and impacts*

Basic infrastructural development is generally grossly inadequate in West Africa. Poorly planned settlements, inadequate and poorly constructed roads, dams, bridges, health facilities and so on, creates high vulnerability to weather and environmental risks. There is also disproportionate distribution of infrastructural facilities in favour of urban areas which reduces the accessibility of the rural dwellers to these basic facilities. Massive rural-urban population drift is resulting in rapid urbanization, which is encouraging the spread of informal settlements, particularly in marginal environments like flood plains and other low lying areas, that are highly vulnerable to flooding, sea surges and rising sea level [49, 56]. These extreme weather events are resulting in infrastructure damages (such as for transportation, health, education, energy, water, communication and so on) and disruption of operation. For instance, in the case of transportation rainstorms, flooding, landslides and sea surges disrupts operation and put stress on supply chain capacity and efficiency. Temperature and rainfall trends are further intensifying the problem of inadequate water supply, sanitation and disaster risk management. Flooding during the rainy season and water scarcity during the dry season has become common experience particularly in urban centres in the region. In addition, urban residents in many West African cities now increasingly face health problems associated with urban heat highlands; like heatstroke, cardiovascular and respiratory, diseases, heat exhaustion and dehydration [49].

Coastal cities also face additional problems of sea surges and sea level rise and associated flooding, coastal erosion, inundation and salinization of aquifers. For instance, it is projected that West Africa will likely experience sea level rise of 1 m by 2100, resulting in substantial inundation of many major cities. It is also predicted that by the 2050s annual damages from coastal flooding in the sub-region will be as high as \$11billion [49]. In coastal parts of Nigeria, the filling up of some mangrove wetlands for development is already resulting in flooding in many areas and could be worsened by climate-change related accelerated sea level rise. If this situation continues unchecked, about 75% of the population living within 200 km of the coast that derive livelihoods from coastal and marine ecosystems in the country will be affected [57]. It has also been estimated that if there is 2 m rise in sea level, at least 6 million people will be displaced in Lagos alone, while about 80% of people in the Niger Delta will be affected [56, 58].

#### *4.5.2 Adaptation and resilience options*

Climate-resilient infrastructure is expected to be planned, designed, constructed and operated in such a way that it projects, prepares for, and adapts to changing climate conditions. It should also be able to withstand and recover quickly from disruptions resulting from extreme weather and climate conditions [59]. Decisions

taken on the siting, building and operation of infrastructure give the chance to lessen vulnerability to the physical impacts of climate change. Climate resilience of new or existing infrastructure can be increased by reducing its exposure or sensitivity to climate-related hazards through various adaptation options depending on the existing situation. Adaptation response may involve the implementation of civil engineering measures to protect assets or other measures that may simply require altering maintenance routines or information-sharing practices [60].

Many West African nations have realized the importance of adapting infrastructure to climate change. For instance, in order to secure coastal roads and ports from flooding, sea surges and sea erosion, Togo has made it a priority to adapt its coastal zones to climate change. This has resulted in investments in coastal protection and preventive management actions and increased monitoring and management of coastal erosion [30]. In Ghana, a number of infrastructure adaptation priorities have been identified for water, energy and transport sectors. For instance, technical adaptation for the water sector include maintaining, rehabilitating and re-engineering existing water systems like dams and irrigation systems. It also includes designing and implementing structural adaptation measures like retarding basins, road elevation and provision of culverts. For the energy sector adaptation options includes adoption of climate resilient designs for facilities and good site selection for energy infrastructure. Other actions are integration of climate adaptation into design of transport infrastructure (like use of materials that reflect solar radiation to reduce temperature of pavement), sealing of unpaved roads, improved road drainage design and planting and management of vegetation along roads [61].

One of the main adaptation priorities in Liberia is the development of infrastructure to reduce the vulnerability of urban coastal zones from erosion, floods, siltation and degradation [62]. For instance, coastal defence projects completed in 2015 reduced erosion, siltation, and degraded coastal landscapes around the capital, Monrovia and other areas. Furthermore, importance was placed on implementation of design standards and planning codes for roads and other infrastructure to cope with flooding, sea level rise and windstorms [63]. Liberia's national policy and response strategy on climate change accentuated the integration of climate resilience in the infrastructure sector. Also, aside from stressing the need to improve the use of weather and climate information in infrastructure planning and development, the strategy emphasised the importance of subjecting infrastructure projects (such as roads, ports and airports) to climate risk screening as part of the planning process [64].
