A Review of Climate-Smart Agriculture Technology Adoption by Farming Households in Sub-Saharan Africa

: Climate change is a major constraint to the progress of Africa’s agriculture, food, and nutrition security; its effect is tied to geographical position and driven by the limited adaptive capacity of the agricultural households. The most vulnerable stakeholder group are the smallholder farming households with limited resources and knowledge of adaptation and mitigation techniques. Sub-Saharan Africa owns more than 60% of the world’s arable land with over 85% of the farmers being smallholder farmers, who are predisposed to various risks. This paper analyzes the adoption of climate-smart agriculture (CSA) processes and technologies by smallholder farming households in Sub-Saharan Africa. The study used mixed methods and an integrative literature review. This review indicated that the knowledge of CSA technologies by smallholder farmers in Africa is increasing and, thus, concerted efforts to continuously generate CSA technology would contribute to the desired positive outcome. To accelerate the pace of adoption and use of the technologies, the linkage of farmers, researchers, and extension practitioners is needed. Measures should also be put in place to ensure that CSA actions are implemented using bottom-up approaches.


Introduction
Across the globe, climate change is rapidly affecting every aspect of life, and the agricultural system is the most affected [1]. There has been a steady yet significant increase in temperature (both maximum and minimum) trends across the Sub-Saharan African (SSA) region. There is also a rise in sea levels, and heavy rains, hailstorms, and droughts have occurred in different locations within SSA in the past decade [2]. This has adversely affected the agricultural sector, it has shifted the farming trends and patterns, and caused the number of emigrants from the Sub-Saharan Africa countries to grow by 50% or more over the years 2010 and 2017 [3]. Food and nutrition security of the farming households has been affected, leaving about 39% of households in a state of food insecurity and as many as 49% of the households with different levels of micronutrient deficiency [4]. This suggests that the United Nations (UN) Sustainable Development Goals (SDGs) one and two (no poverty and zero hunger) may not be actualized on the continent, despite the efforts at different levels to end poverty and increase food and nutritional security globally.
Climate change is greatly shifting the way agricultural activities are being conducted. In every region of SSA, plants, animals, and ecosystems are adapting to the new, unbalanced climatic conditions. The danger of climate is such that when the conditions change slightly, even in a direction that may seem more favorable to humans, the growth of plants and livestock tends to be affected; some will go extinct, and others will become less productive. Some of these shocks can be easily predicted, such as the direct impact of a heatwave on plants at an early stage of growth [5]. The effect of certain changes in climatic conditions may be difficult to predict, such changes could affect the entire ecosystem and its functions.

Materials and Methods
This study was carried out using the mixed-method research approach, and an integrative literature-review method, as described by [13]. The analysis addressed the research papers which were published following the Biennial Climate-Smart Stakeholders Conference, which was held on 1st and 2nd December 2020, and the changes in African agriculture. The research methods require systematic integration of qualitative and quantitative data and analysis within a single investigation [14]. Historical overview, research articles, books, and other publications [13,15] were considered. These approaches aimed to combine various fields of research and the different views from the various publications that emanated from the conference and link them to the current happenings in Africa.
The study concentrated on the Sub-Saharan Africa (SSA) region. It has a land size of about 24 million km 2 [16] and represents 79% of the total land area of Africa and about 18% of the world land area. The SSA lies south of the Sahara and consists of 46 African countries [17] and territories that are fully or partially south of the Sahara. The region is affected by serious environmental problems, including deforestation, soil erosion, desertification, wetlands degradation, and insect infestations. The majority of these environmental problems are further exacerbated by changes in the climate.
Most of SSA has a tropical climate; 70% of the continent lies between the tropic of Cancer (northern tropic) and the tropic of Capricorn (southern tropic), as shown in Figure 1. The region has eight well-defined terrestrial biomes with well-defined agroecological notations and production capacities ( Figure 2).
The largest biome is tropical and subtropical savannahs and grasslands: a mosaic of grasslands, woodlands, bushlands, thickets, and semi-arid drylands that are maintained by fire and grazing. East and southern Africa's miombo and mopane savannah-woodland are included in these ecosystems.
Efforts to deal with the problems of climate change are handicapped by the failure to understand the nature of the problem and possible remedies.  Map of Sub-Saharan Africa's eight terrestrial biomes. The region's topographic complexity, the diversity of biomes, and the multiple ecological transition zones between the different biomes have given rise to rich biodiversity. Source: [19].
The largest biome is tropical and subtropical savannahs and grasslands: a mosaic of grasslands, woodlands, bushlands, thickets, and semi-arid drylands that are maintained by fire and grazing. East and southern Africa's miombo and mopane savannah-woodland are included in these ecosystems.
Efforts to deal with the problems of climate change are handicapped by the failure to understand the nature of the problem and possible remedies.  Map of Sub-Saharan Africa's eight terrestrial biomes. The region's topographic complexity, the diversity of biomes, and the multiple ecological transition zones between the different biomes have given rise to rich biodiversity. Source: [19].
The largest biome is tropical and subtropical savannahs and grasslands: a mosaic of grasslands, woodlands, bushlands, thickets, and semi-arid drylands that are maintained by fire and grazing. East and southern Africa's miombo and mopane savannah-woodland are included in these ecosystems.
Efforts to deal with the problems of climate change are handicapped by the failure to understand the nature of the problem and possible remedies. Map of Sub-Saharan Africa's eight terrestrial biomes. The region's topographic complexity, the diversity of biomes, and the multiple ecological transition zones between the different biomes have given rise to rich biodiversity. Source: [19].
In Table 1, which is shown below, we selected the published papers, following the FARA CSA stakeholders conference which was held on December 1st and 2nd 2020, and some articles, research papers, works, and books that address CSA technologies and CSA utilizations focusing on Sub-Saharan Africa and adaptations of CSA in SSA. The policy brief generated from the conference was considered, as it addressed most of the major issues from the conference. The review identified some innovative CSA practices in the smallholder farming systems; it highlighted the importance of the extension system in delivering knowledge and technologies to the smallholder farmers and the need for an effective policy system to ensure the delivery of CSA gains in SSA. To identify prominent CSA technologies, and assess their utilization, a major search engine like Google search, Google Scholar, and various developmental organization websites viz., FAO, World Bank, and IFAD web pages were (accessed on 30 July, 2021). Emphasis was given to the papers presented and published by authors that participated in the Biennial CSA conference. Six high-quality publications from the conference and nine other reports of original research work on CSA technology generation, adoption, and utilization were selected and reviewed. The contributions of each study to the analysis of CSA technology adoption by smallholder farmers in SSA were assessed.

Review of CSA in Africa: Core Issues and Constraints in Agriculture
Since the early 1970s, climate change and its adverse effects have become a reality in Africa [20], resulting in new and diversified phenomena, including, among other things, an increase in temperature, low agricultural production, intense alterations in weather patterns, and disease transmission. Research has shown that Africa's carbon (CO 2 ) emissions are practically lower than the rest of the world, yet the continent is the most vulnerable to the effects of climate change [34]. Africa's vulnerability to climate change is attached to a chain of factors, including weak adaptive capacity, high reliance on ecosystem goods for livelihoods, and traditional agricultural systems [27]. The impacts of climate change posed a significant challenge to global food and nutrition security, and this is projected to worsen over the coming years due to livelihood pressures, such as a rise in population, economic development, urbanization, and the frequent occurrences of natural hazards, such as extreme temperatures, droughts, and floods, among others [33]. The vulnerability to the constraints from climate change will be further exacerbated by the growing food demand from the increasingly rich population in SSA, and the reduction of the rural population due to huge migrations to the urban cities in search of white-collar jobs [35].
Using general circulation models (GCMs) and the Representative Concentration Pathway 2.6 (RCP2.6), [17] to make a future prediction; it was deduced that the ambient temperature may increase by 1.5 • C by the year 2050; this is far above the 1951-1980 baseline, and shall remain till the end of the century. There is a likelihood of an increase in temperature, droughts, and floods in the coming years [35]. Some regions in Africa are also expected to experience an increase in night temperature in the future, as well as longer and more frequent heatwaves. The projections further showed that some locations within the SSA region will experience strong drying, with a significant increase in the length of dry spells.
In Sub-Saharan Africa, climate change is currently not at its peak; past variations in temperature and precipitation have shown immediate implications for food production and security across the continent [36]. Drought, heat stress, and flooding have exacerbated the already low production of crops, livestock, and aquatic species, and have contributed to the increased rates of malnutrition and poverty, leading to a reduced quality of life and health [5,37]. Food shortages are a known cause of cross-border migration [38], and this is estimated to worsen by the year 2050. The prevalence of hunger and poverty will be highest in SSA in comparison to other locations on the continent, making it substantially hard to access food due to the huge increase in the population [39].
Climate suitability for most crops, animals, and aquatic life is expected to deviate from normal as the climate becomes warm [40]. For instance, West Africa (WA) has been identified as a climate-change hotspot [41], and climate change will lead to a high reduction in crop yields, thus increasing food insecurity in the region [42][43][44]. Climate change in SSA is tied to geographical position and limited adaptive capacity [45], and it is worsened by widespread poverty and low levels of development. Another effect of climate change is the outbreak of diseases, pests, and internal conflicts driven by the depletion of essential resources, such as potable water or vegetation for grazing, etc.
Given these, there is the need to practice and adopt CSA technologies and other practices in SSA. The CSA technological options targeting increased agricultural production could be adopted, tested, and modified to suit the continent. This knowledge and these technologies include advanced plant breeding, genomics, phenomics, advances in plant phenotyping, the use of robots, and artificial intelligence tools [46,47]. The availability of computer resources on plants and animals' genomics, modeling, and improved applications of synthetic biology [48], are providing insights into the complex biological mechanisms which underlie plants' responses to stresses, resulting from climate change. These resources simultaneously provide opportunities to expand the range of how possible plants products can be best adopted. Therefore, Africa must make use of these available CSA technologies (e.g., tools, equipment, methods, and processes, etc.). This will increase the speed at which most agri-food stakeholders adapt to CSA in preparation for the future effects of climate change. Additionally, attention should be drawn to breeding programs focused on breeding crops for high yields and superior adaptability to new and evolving climate scenarios, to ensure sustained food security, biomass production, and ecosystem services in SSA [47].

The Role of CSA Technology Options, Utilization, and Adaptation
CSA technology options integrate traditional and innovative practices, technologies, and services that are important for a particular location to adapt to climate change and variability [49,50]. This involves the use of not only Information and Communication Technologies (ICT) based tools but also plants and animal breeding methods, the use of modern and local greenhouses for crop cultivation, irrigation methods, and innovative livestock production systems. These include the traditional water harvesting systems on the fields, building ridges to store water, fish farming in rice fields [51], and mixed farming and cropping methods. Ideally, innovations, practices, or technologies should address and achieve all the CSA pillars (productivity, resilience, and GHG emission).
Generally, for the CSA technologies options to be effective, researchers and CSA developers should work hand in hand with farmers to develop and make sure these technologies are suitable for the farmers and their environment. Hence, decisions should consider climatic risks, making short and long-term adjustments to the developed technologies, depending on the extent of the current climate variability and expected climate change in the future, which must be carefully monitored. The users of these CSA technologies are the small household farmers who do not have the control, technical knowledge, and ownership of these technologies. Therefore, it is important to involve them in the development of these technologies to ensure the demand, their sense of ownership, and for them to have a good and practical knowledge of the technologies. Figure 3 shows the awareness and use of CSA technologies in Eastern Africa on intercropping, seed selection, improved varieties, agroforestry, and minimum tillage. resources simultaneously provide opportunities to expand the range of how possible plants products can be best adopted. Therefore, Africa must make use of these available CSA technologies (e.g., tools, equipment, methods, and processes, etc.). This will increase the speed at which most agrifood stakeholders adapt to CSA in preparation for the future effects of climate change. Additionally, attention should be drawn to breeding programs focused on breeding crops for high yields and superior adaptability to new and evolving climate scenarios, to ensure sustained food security, biomass production, and ecosystem services in SSA [47].

The Role of CSA Technology Options, Utilization, and Adaptation
CSA technology options integrate traditional and innovative practices, technologies, and services that are important for a particular location to adapt to climate change and variability [49,50]. This involves the use of not only Information and Communication Technologies (ICT) based tools but also plants and animal breeding methods, the use of modern and local greenhouses for crop cultivation, irrigation methods, and innovative livestock production systems. These include the traditional water harvesting systems on the fields, building ridges to store water, fish farming in rice fields [51], and mixed farming and cropping methods. Ideally, innovations, practices, or technologies should address and achieve all the CSA pillars (productivity, resilience, and GHG emission).
Generally, for the CSA technologies options to be effective, researchers and CSA developers should work hand in hand with farmers to develop and make sure these technologies are suitable for the farmers and their environment. Hence, decisions should consider climatic risks, making short and long-term adjustments to the developed technologies, depending on the extent of the current climate variability and expected climate change in the future, which must be carefully monitored. The users of these CSA technologies are the small household farmers who do not have the control, technical knowledge, and ownership of these technologies. Therefore, it is important to involve them in the development of these technologies to ensure the demand, their sense of ownership, and for them to have a good and practical knowledge of the technologies. Figure 3 shows the awareness and use of CSA technologies in Eastern Africa on intercropping, seed selection, improved varieties, agroforestry, and minimum tillage. The above are among the most common groupings of CSA technologies available in SSA. The level of use and awareness in (%) was determined from the selection of over the majority of the smallholder farmers were aware of these technologies but did not know that they were climate-smart technologies, rather, they thought of them as a form of the farming system practices, especially with regard to intercropping. Most of the smallholder farmers said intercropping to them is only a smart revenue generation since they can cultivate more than one type of crop commodity from the same piece of land using the same amount of energy and time. Hence the high use of this technology (85%). In addition, 90% of the farmers said that seed selections are a smart way of getting the best cultivar for planting and that they did not know that this is a CSA technology. It was then noted that CSA technology awareness in East Africa is high and that its use was increasing. The farmers, however, knew little or nothing about the term "CSA technologies", even in the cases where they use climate-smart technologies.
However, in Figure 4, as shown below, the use of CSA technologies was low because smallholders complained that it was expensive to practice these technologies, but they still had a piece of high knowledge about the technologies. Some of the farmers said that these technologies are indigenous since they grew up seeing their fathers and grandfathers practicing these types of farming. It was, however, difficult to persuade them that these were climate-smart farming methods and not just indigenous farming. 10,000 farmers each from Ethiopia, Kenya, and Uganda in 2014-2015, to ascertain the levels of the commonly available CSA technologies in the continent. However, it was noted that the majority of the smallholder farmers were aware of these technologies but did not know that they were climate-smart technologies, rather, they thought of them as a form of the farming system practices, especially with regard to intercropping. Most of the smallholder farmers said intercropping to them is only a smart revenue generation since they can cultivate more than one type of crop commodity from the same piece of land using the same amount of energy and time. Hence the high use of this technology (85%). In addition, 90% of the farmers said that seed selections are a smart way of getting the best cultivar for planting and that they did not know that this is a CSA technology. It was then noted that CSA technology awareness in East Africa is high and that its use was increasing. The farmers, however, knew little or nothing about the term "CSA technologies", even in the cases where they use climate-smart technologies. However, in Figure 4, as shown below, the use of CSA technologies was low because smallholders complained that it was expensive to practice these technologies, but they still had a piece of high knowledge about the technologies. Some of the farmers said that these technologies are indigenous since they grew up seeing their fathers and grandfathers practicing these types of farming. It was, however, difficult to persuade them that these were climate-smart farming methods and not just indigenous farming.

Sub-Sahara Africa Population Distribution in Rural and Urban Cities
SSA is known to have a population largely involved in agriculture as its main source of income and livelihoods, and hence a majority of the population (59%) lives in the rural areas/farming communities of the region. Figure 5 below shows the trend in the growth of urbanization for the past 10 years.

Sub-Sahara Africa Population Distribution in Rural and Urban Cities
SSA is known to have a population largely involved in agriculture as its main source of income and livelihoods, and hence a majority of the population (59%) lives in the rural areas/farming communities of the region. Figure 5 below shows the trend in the growth of urbanization for the past 10 years. It can be seen from Figure 5 above that urbanization in SSA is increasing steadily and this has affected food security in the region. As more people migrate to the cities, fewer people are engaged in farming activities in the rural area of SSA, resulting in a decline in food production and supply. This is further exacerbated by the change in climatic conditions. The population increase in the region is a major contributor to deforestation and climate change in Sub-Saharan Africa in different ways. Forests are being destroyed for buildings and energy production, and factories are being built in urban areas, which attracts rural-to-urban migration. Similarly, urban transportation is on the rise, as more people migrate into the urban areas, causing more CO2 to be released into the atmosphere [55,56]. Conversely, smallholder low-production agriculture plays an important role in forests being maintained, as they ensure food security [57].

Farmer Households and Demographic Change
As it is projected that the population in SSA is going to double by the year 2050, there is the likelihood of an increase in food demand and an increase in urbanization [11]. Africa is largely dependent on smallholder farmers for the majority of its food, and an increase in population means less food and increased food insecurity in the continent.
In the literature, the term "farming household" is often used interchangeably with that of "smallholder farms". In this context, references to size and vulnerability level to climate change are prominent. The term 'smallholder' refers to the farmers with limited resources compared to other groups of farmers in the sector [58]. Smallholder farmers can cultivate as little as one hectare or as much as ten hectares or more, depending on population density and agro-ecological zones; often, no sharp distinction between smallholders and other larger farms is necessary.
Smallholders represent the largest number of farm holdings in Sub-Saharan African countries, however, there has been a proposed size limit to smallholders and family farms in certain regions or contexts. For example, Refs. [59][60][61] stated that the most common measure of a smallholder farm in Asia and the Pacific is one or two hectares or less of cropland. This is consistent with observations in SSA. The smallholder farmers are usually faced with many challenges, including access to limited funds for agricultural activities, low storage facilities, diseases and pests, and postharvest losses. The production and productivity from these farmers are low and may not be able to meet the growing need for food and fiber. This suggests that SSA will need to produce more to be able to feed its It can be seen from Figure 5 above that urbanization in SSA is increasing steadily and this has affected food security in the region. As more people migrate to the cities, fewer people are engaged in farming activities in the rural area of SSA, resulting in a decline in food production and supply. This is further exacerbated by the change in climatic conditions. The population increase in the region is a major contributor to deforestation and climate change in Sub-Saharan Africa in different ways. Forests are being destroyed for buildings and energy production, and factories are being built in urban areas, which attracts rural-to-urban migration. Similarly, urban transportation is on the rise, as more people migrate into the urban areas, causing more CO 2 to be released into the atmosphere [55,56]. Conversely, smallholder low-production agriculture plays an important role in forests being maintained, as they ensure food security [57].

Farmer Households and Demographic Change
As it is projected that the population in SSA is going to double by the year 2050, there is the likelihood of an increase in food demand and an increase in urbanization [11]. Africa is largely dependent on smallholder farmers for the majority of its food, and an increase in population means less food and increased food insecurity in the continent.
In the literature, the term "farming household" is often used interchangeably with that of "smallholder farms". In this context, references to size and vulnerability level to climate change are prominent. The term 'smallholder' refers to the farmers with limited resources compared to other groups of farmers in the sector [58]. Smallholder farmers can cultivate as little as one hectare or as much as ten hectares or more, depending on population density and agro-ecological zones; often, no sharp distinction between smallholders and other larger farms is necessary.
Smallholders represent the largest number of farm holdings in Sub-Saharan African countries, however, there has been a proposed size limit to smallholders and family farms in certain regions or contexts. For example, Refs. [59][60][61] stated that the most common measure of a smallholder farm in Asia and the Pacific is one or two hectares or less of cropland. This is consistent with observations in SSA. The smallholder farmers are usually faced with many challenges, including access to limited funds for agricultural activities, low storage facilities, diseases and pests, and postharvest losses. The production and productivity from these farmers are low and may not be able to meet the growing need for food and fiber. This suggests that SSA will need to produce more to be able to feed its population. Moreover, an increase in population has been seen as a threat, as it puts pressure on limited natural resources, and increases the CO 2 level in the atmosphere through farm activities, various logistics, and the industrial processing of agricultural commodities.

Current Knowledge on the State of CSA Farmer Household Adoption in SSA
Africa is most vulnerable to the effects of climate change, which is partly due to social, economic, and environmental factors. Climate change is rapidly interacting with non-climate drivers, and this amplifies the vulnerability of agricultural systems, mainly in the SSA region, as confirmed by FARA in 2015 [52]. The evidence of climate change has called for more knowledge in developing tools, technologies, and methods to deal with this global evil of our time, which has left SSA most vulnerable. Although there are CSA practices that have been adopted and used by farming households, these still have limited knowledge of the concept of CSA and its practices [62].
In recent years, the use of radios, televisions, and other communication tools to communicate weather variations, when to expect rain, and other factors relating to rainfall, have led to the easy adoption of some of these CSA technologies by farmers, both directly and indirectly. However, a case study conducted in 2016 in West Africa, as presented in Table 2, showed that the majority (85.0%) of farmers rely on their personal experience to predict weather events, 75.3% depend on radio/television to access weather information, while 19.6% used a mobile phone to access weather information. Farmer-to-farmer knowledge sharing was recorded at 87.2%. Table 2. CSA practices adopted by farmers in West Africa.

Practices Responses (%) Yes
Weather smart Use personal experience to predict weather events 85.0 Usage information from radio/T.V for weather events 75.3 Received training/education from an extension worker/agent on weather 54.4 Use a mobile phone to access weather information 19.6 Access to weather information on the internet 11.8 Water smart Plant early during the rainy season to make use of rainwater 76.8 Plant cover crops to maintain soil moisture 43.4 Harvest and store rainwater for future use in watering crops and feeding animals 12 A study report from [31] showed that between 25% and 34% of households across four localities in Tanzania had used at least one of the CSA technologies listed in Figure 6 on their farms during the growing season. However, they noticed that adoption rates varied by practices, therefore affirming the fact that CSA is location-, area-, and site-specific [64,65]. The application of chemical fertilizers was used by 34% of farmers across all regions of the study, with the highest adoption rates in Iringa (48.4%). Livestock diversity and irrigation were the least commonly used practices at 26% each across all the regions of their study, although 46.7% of households reported irrigating their farms in Zanzibar. The highest livestock diversity recorded was in Iringa (41.9%) and the lowest in Zanzibar with 9.7%. Overall, 25.1% of the households had a diverse crop production.
A study report from [31] showed that between 25% and 34% of households across four localities in Tanzania had used at least one of the CSA technologies listed in Figure 6 on their farms during the growing season. However, they noticed that adoption rates varied by practices, therefore affirming the fact that CSA is location-, area-, and site-specific [64,65]. The application of chemical fertilizers was used by 34% of farmers across all regions of the study, with the highest adoption rates in Iringa (48.4%). Livestock diversity and irrigation were the least commonly used practices at 26% each across all the regions of their study, although 46.7% of households reported irrigating their farms in Zanzibar. The highest livestock diversity recorded was in Iringa (41.9%) and the lowest in Zanzibar with 9.7%. Overall, 25.1% of the households had a diverse crop production. Figure 6. Adoption levels of CSA technologies in four (4) locations in Tanzania and the overall rate (%). Source: [31].
Iringa is an urban city in East Africa with a population of about 151,000 people. It has a fairly dry, subtropical highland climate bordering on a tropical savanna climate, and it has a wet season from December to April. Zanzibar has a rainfall regime split into two main seasons, a primary maximum in March, April, and May in association with the southwest monsoon, and a secondary maximum in November and December [66], resulting in farming being the major activity in this area. Dodoma possesses a semi-arid climate with warm to hot temperatures throughout the year. While average highs are somewhat consistent throughout the year, average lows dip to 13 °C (55.4 °F) in July. Dodoma averages 610 millimeters or 24 inches of rainfall per year, the vast majority of which occurs during its wet season between December and April. The remainder of the year comprises the city's dry season. Similarly, Tabora and its people mainly rely on agricultural activities as either sustenance farmers or small-scale farmers. It has a tropical savanna climate with two seasons of approximately equal length. The wet season is from November to April and is followed by a dry season from May to October. The figure below gives a presentation of the rate of CSA adoption in the four locations in Tanzania.
Broadly, farmers encounter several issues concerning their farming activities, as shown in Table 3 and Figure 6. From the two studies above of both West and Eastern Africa, farmers face some challenges, from economic issues to social and site-specific issues. Farmers agreed they had access to sustainable agriculture technologies in both regions, with little or no training at all. Moreover, although there are available CSA technologies in SSA, their utilization is still low. This confirms the report of [67] that CSA use by smallholder farms presents an added opportunity to embark on rigorous promotional campaigns for effective CSA adoption, and that this could begin with the local media and Iringa is an urban city in East Africa with a population of about 151,000 people. It has a fairly dry, subtropical highland climate bordering on a tropical savanna climate, and it has a wet season from December to April. Zanzibar has a rainfall regime split into two main seasons, a primary maximum in March, April, and May in association with the southwest monsoon, and a secondary maximum in November and December [66], resulting in farming being the major activity in this area. Dodoma possesses a semi-arid climate with warm to hot temperatures throughout the year. While average highs are somewhat consistent throughout the year, average lows dip to 13 • C (55.4 • F) in July. Dodoma averages 610 millimeters or 24 inches of rainfall per year, the vast majority of which occurs during its wet season between December and April. The remainder of the year comprises the city's dry season. Similarly, Tabora and its people mainly rely on agricultural activities as either sustenance farmers or small-scale farmers. It has a tropical savanna climate with two seasons of approximately equal length. The wet season is from November to April and is followed by a dry season from May to October. The figure below gives a presentation of the rate of CSA adoption in the four locations in Tanzania.
Broadly, farmers encounter several issues concerning their farming activities, as shown in Table 3 and Figure 6. From the two studies above of both West and Eastern Africa, farmers face some challenges, from economic issues to social and site-specific issues. Farmers agreed they had access to sustainable agriculture technologies in both regions, with little or no training at all. Moreover, although there are available CSA technologies in SSA, their utilization is still low. This confirms the report of [67] that CSA use by smallholder farms presents an added opportunity to embark on rigorous promotional campaigns for effective CSA adoption, and that this could begin with the local media and through the agricultural extension agents. Capacity building at all levels of CSA discourse is also very crucial. Climate change has caused some regions within SSA to become drier and hotter, and this has led to bush fires. Several burnt areas were recorded in SSA, and it was recorded that Guinea was the most affected. Data from 2014 through 2016 indicated that a total land area of about 41,905.31 to 59,037.09 km 2 was subjected to bush fires [68]. This is very alarming, as Sub-Saharan Africa is predicted to become warmer and drier by the year 2050 [69]. Leveraging sustainable agricultural technologies is the way to support growth in the sector; as shown in the table below, this provides the needed hope to African agriculture, as more farming households [70,71] confirmed that sustainable agriculture practices are the way to ensure a food-secure continent.
Knowledge networks that are supporting farmers with information on technologies, input, and output, as well as linkages to financial sources, are growing in Africa. For instance, the FARA D-groups platform (https://faraafrica.community/fara-net (accessed on 30 June 2021) is a well-acclaimed information dissemination instrument among agricultural research and development experts in Africa. The Innovation Platform Agribusiness Portal (https://ipabp.org/ (accessed on 30 June 2021)) is focused on compiling and disseminating best practices and useful research findings to farmers in an easily understandable language [57]. There are several other "platforms", such as the FAO TECA (http://www.fao.org/teca/en/ (accessed on 30 June 2021)), which enhance the exchange of new knowledge and innovations for practical uptake and further adoption. With the growing knowledge of CSA in SSA, it is time to effectively engage the farming household with the entire process of developing CSA technologies. This will foster good technology demand testing good adoption since the technologies will address the need of the end-users, the farmers.

Conclusions
This review indicated that the research results that were presented at the Biennial Climate-Smart Agricultural Stakeholders Conference, held on 1st and 2nd December 2020 responded to the three pillars of CSA, namely, food security, adaptation, and mitigation. Our study revealed that the factors that hinder the adoption rate of CSA technologies in Africa include, poor engagement of the private sector actors; poor policy coherence, inadequate technical capacity to generate and disseminate technologies, and poor access to finances.
The farming household in most SSA countries is oblivious of the CSA technologies because of improper marketing. Most of the production systems that support good CSA practices are not new, and therefore the smallholder farmers are not convinced of the novelty when they are introduced. However, there has been an invention of varieties that are early maturing, drought-tolerant, pest and disease resistant, and can thrive under unfavorable weather conditions. It is imperative that the agricultural research and development actors in Africa need to properly define a technology or production practice as a CSA-compliant technology when will it qualify as such. This characterization is vital to ensure the proper packaging of different pieces of knowledge, technologies, and inventions that are disseminated under the label of CSA. The South-South and North-South-South partnerships could be explored for this knowledge and technology exchange, among countries as well as in capacity development.
Within Africa, there is the need for more effective collaboration between researchers, extensions, policymakers, and other non-state actors, in promoting the use of CSA-compliant technologies and production systems. This has received modest attention in the past through the development of the Agricultural Innovation Systems (AIS) as the mode of implementing agricultural research for measurable impacts. However, the AIS is still too much in its infancy to orchestrate the desired broad-based paradigm change.
SDG one and two (poverty eradication and zero hunger) stands the risk of not being achieved by the year 2030 if a drastic effort is not channeled to widely encourage access to sustainable technology and use in Africa agriculture.
Our study further showed that the demographic shift in Africa countries especially the recent upsurge in youth population and its different social implications, such as unemployment, rural-urban migration, increase in antisocial activities, violent behaviors, terrorism, etc. have an indirect but noticeable implication on climate change and the need for CSA. Other demographic changes, such as the increase in the proportion of individuals in the middle class has resulted in increasing demand for industrially processed food and more carbon emission.
As a recommendation, we propose good capacity building and youth empowerment to champion CSA technology adoption and utilization in the continent. It is further recommended that farmers are capacitated to change their orientation about the effect of climate change and the best practice to adopt in compliance with the three pillars of CSA.