Abstract
Climate change strongly affects the health of sub-Saharan African populations. Effective adaptation strategies are required in order to enhance their limited adaptive capacities. The DFG-funded Research Unit (RU) “Climate change and health in sub-Saharan Africa” unites nine research institutions from Burkina Faso, Kenya, Germany, and Switzerland that will design, implement, and evaluate four different adaptation projects in these two African countries from 2020 until 2022.
First, the effectiveness of an agro-biodiversification and nutrition program will be established for the reduction of child undernutrition of climate-sensitive nutrients in rural Burkina Faso and Kenya. Two respective cluster-randomized controlled trials (cRCT) will be conducted, each consisting of 2 × 600 children. Second, another cRCT will be conducted among 2 × 300 households in rural Burkina Faso to investigate how sunlight-reflecting cool-roof coatings affect human health outcomes, including cardiovascular and heat-related outcomes. Further outcomes comprise indoor temperature, carbon footprint, and productivity. Third, an index-based weather insurance (IBWI) will be introduced in rural Burkina Faso. The effects of IBWI on childhood nutritional status, dietary behavior, and healthcare seeking will be determined in 2 × 20 villages. Fourth, microbial larviciding has been evaluated as a promising environmental control for malaria vectors in Burkina Faso. Here, the interactions between climatic factors and the effectiveness of the intervention will be tested using spatiotemporal models.
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Keywords
Introduction: Proposed Adaptation Strategies for Climate Change Impacts in Two Exemplar Regions of Sub-Saharan Africa
Climate change constitutes one of the biggest threats and opportunities to global health (Costello et al. 2009; Watts et al. 2015). The World Health Organization (WHO) estimates that between 2030 and 2050, climate change will cause approximately 250,000 additional deaths/year, with an increasing trend (WHO 2014). Indeed, global warming, weather instability, and weather extremes have emerged as major risk factors for global health acting on their own or modifying the effect of the wide array of the immediate and intermediate determinants of health. The recent report by the International Panel on Climate Change (IPCC) has concluded that climate change is expected to exacerbate a wide range of health problems, including undernutrition, vector-borne diseases, and noncommunicable diseases (IPCC 2017; Woodward et al. 2014). The report further points to the heat-mediated productivity losses, not least in agricultural production in low-income settings (Kjellstrom et al. 2017). While the causes, impacts, and mitigation efforts of climate change truly act globally, efficient and effective adaptation strategies require local solutions. This is particularly true for sub-Saharan Africa, where climate change impacts on health are felt strongest because the populations there exhibit the least adaptive capacity.
Autonomous and planned adaptations will be necessary to meet the challenges of common smallholder subsistence systems in sub-Saharan Africa (IAASTD 2009). Small-scale subsistence farmers are defined as rural households with agricultural-based access (max. 2 ha) to essential resources for survival (Grace et al. 2012). Proposed adaptation strategies generally refer to risk management or production enhancement, and include:
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Altering the timing or the location of cropping activities and the diversification of agriculture (Constanzo and Bàrberi 2013)
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Increasing the access to financial and technological resources that facilitate adaptation to climate change (Bizikova et al. 2009)
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Risk protection by index-based weather insurance (IBWI) as one option of market-based risk management mechanisms (Leblois and Quirion 2013)
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Novel methods of vector control to overcome drug resistance, changes in vector-biting behavior, and altered vector species (Tusting et al. 2013)
Herein, four specific adaptation strategies are described that will be designed, implemented, and evaluated over the next 3 years (2020–2022) within the framework of the Research Unit (RU) “Climate Change and Health in sub-Saharan Africa,” funded by the German Research Foundation (DFG). The RU builds on previous collaborations and existing research infrastructure within the Health and Demographic Surveillance Systems (HDSS) in Nouna (Burkina Faso) and Kisumu (Kenya). The locations and the characteristics of the two HDSS sites are presented in Fig. 1 and Table 1, respectively.
According to the gross domestic product (GDP) per capita, Burkina Faso is one of the poorest countries in the world, whereas Kenya ranks among the lower-middle-income countries (World Bank 2018). The HDSS sites Nouna and Kisumu have been established in the early 1990s; the Kisumu area is more densely populated than the Nouna site. Climate-wise, these two HDSS locations differ: Nouna experiences one rainy season per year with excessive rainfalls in August and high temperatures during the dry season; Kisumu has two rainy seasons and experiences lower temperatures in the highlands. The inhabitants of both regions live on small-scale subsistence farming, which is complemented by fishing in the Kenyan areas close to Lake Victoria. The typical diets in both regions are based on starchy staples and legumes. According to the Living Standards Measurement Study (LSMS) by the World Bank, the share of livelihoods from subsistence farming in both areas ranges between 70% and 90% (World Bank 2017). The proportion of children with acute and chronic undernutrition tends to be higher in Kisumu than in Nouna. Both areas are holo-endemic for malaria transmission with similar prevalence among children. HIV incidence in Kisumu is three-times higher than in Nouna.
Strategy 1: Agro-Biodiversification and Nutrition Intervention in Rural Burkina Faso and Rural Kenya
Background
Climate change impacts food security through direct and indirect pathways (Myers et al. 2017), and presumably affects the spread of malaria in sub-Saharan Africa (Caminade et al. 2014; Dasgupta 2018). Increased greenhouse gas emissions, particularly CO2, reduce the contents of iron, zinc, and protein in major staple foods in this region (Myers et al. 2014; Smith and Myers 2018). This development will likely slow down the reduction of macro- and micronutrient undernutrition in the most vulnerable population group of children aged <5 years and their mothers (Smith and Myers 2018). As an integral part of a food-systems approach, agricultural bio-diversification seems to be a promising tool to achieve resilience against increased atmospheric CO2, improved dietary diversity, and thus, adequate micronutrient supplies and protein utilization (Constanzo and Bàrberi 2013; Olney et al. 2015). Still, the success of such adaptation strategies depends on the local food supply chains (Sibhatu et al. 2015) and remains to be established for sub-Saharan Africa. In addition, a healthy nutritional status through agricultural bio-diversification may also reduce the risk of clinical malaria among young children living in endemic regions (Danquah et al. 2009). Yet, expanding the agricultural land cover bears the adverse potential of generating breeding sites for malaria vectors, thereby fueling parasite transmission (Janko et al. 2018).
This project addresses the potential of a household, agricultural bio-diversification, and nutrition program to improve the nutritional status and to reduce episodes of clinical malaria among young children and their mothers living in two subsistence and malaria-endemic areas of rural sub-Saharan Africa. The specific research objectives are:
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(i)
To establish the baseline cross-sectional associations of self-sufficient food supply and dietary habits with the status of climate-sensitive nutrients (protein, iron, zinc) among children at the age of supplementary feed introduction (6–24 months) and their mothers in rural Burkina Faso and rural Kenya.
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(ii)
To establish the effects of the agricultural bio-diversification and nutrition program on dietary habits, anthropometric measures of protein-energy undernutrition, micronutrient status, and the risk of clinical malaria among young children and their mothers.
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(iii)
To quantify the relative contributions of additional household greenspace and improved childhood nutritional status through this agricultural and nutrition intervention to malaria risk in children.
Procedures
This project will start in January 2020 and involves the scientific evaluation of an integrated agriculture and nutrition program focusing on agricultural bio-diversification to improve the status of climate-sensitive nutrients among children aged 6–59 months. For this purpose, this study will adopt a program that was successfully implemented and evaluated in other parts of rural Burkina Faso (Olney et al. 2015). The conceptual framework of this intervention program relies on three impact pathways that are depicted in Fig. 2:
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Increased production of climate-resilient horticultural crops and diversification of crops for increased consumption of these foods.
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Increased output of foods to increase income.
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Increased knowledge related to the importance of agricultural diversification (= use more indigenous plants) for the resilience of local crops and thus, food and nutrient security for healthy families, thereby increasing the adoption of optimal practices.
More specifically, the study will conduct two cluster-randomized controlled trials (cRCT), enrolling 600 households at each site with children at the age of supplementary feed introduction (6–24 months) at baseline. These households will be randomized to the control group or the intervention group. The intervention will comprise an agriculture component and a nutrition part. The agriculture component will foster agro-diversification using horticultural crops in home gardens, based on village model gardens and specific trainings. The nutrition component comprises regular sessions on Behavior Change Communication focusing on the seven Essential Nutrition Action (ENA) messages by the World Health Organization. After an observation period of at least 12 months, height-for-age z-scores among the enrolled children (30–48 months) will be assessed as the primary nutrition and health-outcome. Secondary outcomes include weight-for-age z-score, weight-for-height z-score, iron and zinc status, incl. hemoglobin concentrations (Hb), species richness in home gardens, dietary behavior, and associated costs. The data will be analyzed on an intention-to-treat basis by random effects linear models and accounting for the cluster design. The formative research of this project has started in September 2019; the recruitment of households with young children is envisioned for the middle of 2020; and follow-up shall be completed in the first quarter of 2023.
Strategy 2: Cool Roofs to Improve Human Health, Environmental and Economic Outcomes in Rural Burkina Faso
Background
Increasing mean global temperature and extreme heat are adversely affecting people’s health. Projections show that warming of 4 °C in 2100 relative to preindustrial levels in sub-Saharan Africa will result in an increase of monthly summer temperatures by 4–6 °C above present-day temperatures (Schellnhuber and Hare 2013). Even if warming is limited to within 2 °C by 2050, adaptation costs in Africa are expected to rise to USD 35 billion/year, while warming in the range of 3.5–4 °C, as projected under current emissions, will elevate adaptation costs dramatically to USD 50 billion/year (AMCEN, UNEP, and Climate Analytics 2013). These costs highlight the need for early action.
Millions of homes in resource-poor countries are built with low-cost materials, such as corrugated metal roofing sheets, that expose occupants to high temperatures. Owing to their high expense and electricity use, technologies such as air conditioners are ill-suited in resource-poor settings to alleviate the discomfort from heat. In sub-Saharan Africa, where climate change effects on health and well-being are most severe, adaptive technologies do not yet meet the needs of populations to ease the burden from heat.
Advances in housing technologies can passively reduce indoor temperatures through increased solar reflectance and catalyzed thermal emittance (Singh et al. 2010; Howden-Chapman et al. 2007). Cool roof coatings in the form of a liquid applied membrane (LAM) are a promising, low-cost intervention to reduce indoor temperatures that may prove suitable for immediate wide-spread use across new and existing building stocks. Cool roofs that reflect direct sunlight can stay cooler than roofs that absorb sunlight. Solar reflectance (the ability to reflect the visible wavelengths of sunlight, reducing heat transfer to the surface) and thermal emittance (the ability to radiate absorbed solar energy) are the two main mechanisms through which cool roofs reduce indoor heat (Levinson et al. 2002). In clear skies, up to 95% of solar radiation is absorbed by a typical roof surface; cool roofs can substantially reduce this fraction (Dabaieh et al. 2015).
LAMs are sprayed or painted on the roof surfaces and seem to be the most suitable cool roof technology for existing homes in Nouna, Burkina Faso, because they can effectively coat surfaces with undulations or complex roofing structures such as mud bricks or corrugated tin. Different LAM types have different Solar Reflectance Indices (SRIs), which indicate the level of solar reflectivity. LAM substances can also be easily transported and are created on site.
Furthermore, LAM roofs have minimal upfront costs, zero maintenance costs, and possible co-benefits of carbon emission reduction and air quality improvements. Despite the potential for alleviating the burden of heat on the poorest households, the effect estimates on environmental and human health outcomes of cool roofs in sub-Saharan Africa remain unknown. The study site is therefore located in north-west Burkina Faso – characterized by hot dry seasons with temperatures exceeding 40 °C and a wet rainy season.
The long-term research goal is to identify viable passive housing adaptation technologies with proven health and environmental benefits to reduce the burden of heat stress in communities affected by heat in Africa. The specific objectives of this study are to:
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(i)
Establish the cultural acceptability of different types of LAM-based cool roofs in Nouna, Burkina Faso
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(ii)
Establish the effect of the cool roof on the primary endpoint heart rate as an indicator of physiological stress
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(iii)
Determine the effects of the cool roof on a range of secondary endpoints, including indoor temperature, indoor humidity, cardiovascular morbidity and mortality, household energy consumption, and socioeconomic outcomes
Procedures
Within the RU, this project will start in January 2020 to test a cool-roof coating on mud-brick and tin roofs in Burkina Faso. The project will collect health, environmental, and economic outcome measures, with the primary outcomes being health-related, including heart rate and core body temperature.
First, a formative qualitative study will be conducted to establish the cultural acceptability of the cool roofs. Several versions of the cool roof are possible, with different appearances and different technical properties. For the successful execution of this trial and for long-term impact, it will be important to understand how best to introduce and apply the cool roof in a community and in individual homes and which color and surface material to offer. The trial will start with a formative qualitative study to elicit the local meaning of climate adaptation using the cool roof as well as perceptions of and preferences for particular cool roof colors and surface materials. Second, a cool roof mechanism study will be conducted. Before embarking on a large-scale cluster randomized controlled trial, a small-scale study of mechanisms in eight households will be conducted, which will serve two purposes. First, it will provide pilot data to optimally design the trial processes given the real-life constraints of working in rural Burkina Faso. Second, it will provide fundamental quantitative insights into the physical mechanisms of the cool roof. Most importantly, the third part will comprise a cluster-randomized controlled effectiveness trial. To date, the effects of cool roofs has not been tested in randomized controlled trials, even though such rigorous causal tests are highly feasible. In addition, there have been no studies of cool roof effectiveness in sub-Saharan Africa, the subcontinent where both the effects of climate change will be most severe and the current capacity to adapt to climate change is most limited. Thus this study will be the first cool roof cluster-randomized controlled trial (cRCT) to establish the effects of the technology on critical heat, health, and socioeconomic outcomes in 600 households. The target primary and secondary endpoints include home temperature and humidity, heart rate, core body temperature, hydration status, thermal comfort, cognition, blood pressure, and clinic and hospital utilization.
Strategy 3: Index-Based Weather Insurance in Rural Burkina Faso
Background
Emerging evidence highlights the role of climate change in the rise of climate variability and extremes around the globe (Kotir 2011). In turn, increased climate variability and extremes negatively affect the overall stability of global food systems through the decrease in food production (Rosenzweig et al. 2001). Climate change-induced production disruptions increase rural small-holder farmers’ vulnerability to undernutrition and poverty (Herrera et al. 2018). This is especially true in sub-Saharan Africa (SSA), where rural households depend mainly on rain-fed subsistence farming and consume around 70% of what they produce (Belesova et al. 2018).
A plethora of adaptation strategies (such as crop diversification, savings, credit, informal risk-sharing arrangements at the community level) has been proposed to address the risk that climate change poses to food production (Dercon et al. 2014). Index-based weather insurance (IBWI) emerges as a promising solution vis à vis traditional crop insurance which suffers from high operational costs and premium because the indemnity payment requires strenuous verification of production losses on each farm. The verification process can be challenging in settings where farms are small and scattered, as is the case in smallholder subsistence farming in rural SSA (Leblois and Quirion 2013). In contrast, IBWI ameliorates the high operational costs and the cumbersome indemnity verification process by making indemnity payments conditional upon an objective and independently measurable weather index (e.g., rainfall or temperature index) (Skees 2008). Payment to the insured is triggered when the index falls below or above a pre-agreed threshold (Carter et al. 2014). IBWI is by no means the panacea for handling all farm losses risk faced by small-scale farmers but stands as the option with the most significant potential of “getting the big risk out of the way” (Skees 2008).
Procedures
With specific regard to the field of research, IBWI is expected to produce health gains through two distinct impact pathways that are depicted in Fig. 3. First, IBWI will expectedly improve health by improving nutritional status thanks to improved food security. Second, households who enjoy IBWI protection are anticipated to experience a lower need for saving and hence to have more disposable income for other expenses, including health service utilization, a fundamental element to maintain and restore one’s health. There exist approximately 18 IBWI schemes in SSA. The majority of these schemes are in operation, but face multiple challenges pertaining to the demand, index design, and institutional support (Hess and Hazell 2016).
So far, the literature on IBWI has concentrated on index design problems such as basis risk and farmer characteristics that influence demand and uptake of IBWI. Less is known about how the different stakeholders (national and global policy agents, first-line implementers, and beneficiaries) interact in the design and implementation of IBWI and how this interaction might affect the success and scalability of IBWI (Duru 2016). In particular, since the literature on IBWI has been dominated by development and agricultural economics, little attention has been paid to whether concerned stakeholders conceptualize the link between insurance and health, via the causal links outlined earlier. To bridge this knowledge gap during the RU lifetime (2020–2022), a political economy analysis (PEA) (Participants at the Bellagio Workshop on Political Economy of Global Health 2015) will be conducted to understand institutional interactions of the different stakeholders involved in the design and implementation of IBWI. The PEA will be grounded in document analysis and key informant interviews, to examine how structures, institutions, and agents work towards the implementation of IBWI in Burkina Faso and Kenya. In light of recent literature highlighting polycentric governance as a driving force of policy development in LMICs, the work will also address the role of international agencies in shaping the emergence of IWBI as a climate change adaptation strategy in SSA.
Strategy 4: Larviciding Against Malaria Vectors in Rural Burkina Faso
Background
Despite intense worldwide efforts, malaria is still the world’s most important and deadly tropical mosquito-borne parasitic disease. It is responsible for an estimated 435,000 deaths and 219 million disease cases (WHO 2019). Variation in climatic parameters such as temperature, rainfall amount and patterns, and humidity are known to exert influence on malaria transmission through direct influence on the life cycle of vector mosquitoes and malaria parasites (Okuneye et al. 2019).
Climate change is likely to worsen the malarial situation in many areas where malaria transmission already takes place, while, at the same time, it might grant relief in few other regions (Murdock et al. 2016). Additionally, new areas that have been traditionally malaria free, such as regions in the cooler climate and at a higher altitude, will experience an increased risk for transmission. Climate change greatly impacts and alters the El Niño cycle that is known to be associated with increased risks of some diseases transmitted by mosquitoes, such as malaria, dengue, and Rift Valley fever (Mabaso and Ndlovu 2012). In dry climates, heavy rainfall can provide good breeding conditions for the mosquitoes, while droughts in wetter areas can facilitate the formation of more mosquito breeding sites. Climate change together with an increase in resistance of vectors against insecticides and observed changes in mosquito biting behavior poses a threat to the efficacy of traditional vector control measures such as impregnated nets and indoor residual spraying that are currently in place (Ashley et al. 2014; Killeen et al. 2016; Thomas and Read 2016). For securing and improving current achievements in malaria vector control in a changing climate, it is more important than ever to administer control efforts in an integrated fashion, adding additional approaches, without pulling out from the already implemented ones.
Several of these shortcomings in current malaria vector control can be addressed, to varying extent, by extending control efforts to vector larvae. Other than chemicals such as DDT that were used in previous control and eradication efforts, modern vector larvae control can rely on biological larvicides such as Bacillus thuringiensis israelensis (Bti) . Those are environmentally safe, target species-specific in their mode of action, and show no resistances (Becker 2000). Within the last decade, there has been generated a large body of evidence, showing that Bti-based larviciding can bring down malaria vector populations by order of magnitude and significantly reduce malaria prevalence (Tusting et al. 2013; Dambach et al. 2019). One of the main advantages of larviciding is that the vector larvae cannot elude intervention, and they can be targeted where they are concentrated and easily detectable. Dambach et al. have already shown in 2016 that Bti-based larviciding can be provided at low cost, similar to or lower than those of LLINs (Dambach et al. 2016; Maheu-Giroux and Castro 2014). Future formulations of Bti with increased residual effect and the use of new substances such as insect growth regulators are likely to reduce intervention costs further.
Procedures
The way of how larviciding is carried out depends on the used larvicide. The most common approach is to perform larviciding during the period of highest malaria transmission, which follows the period of highest vector abundance, which, in most settings, is the rainy season. In the case of Bti, the mostly used larvicide formulation is dissolved in water and then brought out with knapsack sprayers onto the surface of potential mosquito breeding sites such as ponds, puddles, roadside ditches but equally to smaller features such as tire marks or hoof prints that are filled with water (Fig. 4). Within several hours up to 1-day posttreatment, the larval stages of mosquitoes will have died off, which can be confirmed by visual control. Due to Bti’s organic structure and sedimentation, it loses efficacy after a few days and reapplication is required (Dambach et al. 2014). In tropical climate, this retreatment interval is shorter compared to higher latitudes, and larviciding has to be carried out again every 8–10 days. Hence, depending on the duration of the rainy season, and the ambient temperature, only a few up to more than ten treatment rounds might be needed to effectively control vector populations. Besides the implementation of a meticulously followed spraying calendar, it can be beneficial to monitor larviciding success as a part of quality control, in particular during the first time of carrying out. The first step of program quality control is performed by determining the larvae kill-off rate. As a next step, adult vector abundance is monitored through different types of traps and catchment techniques and compared to a pre-intervention baseline or an untreated reference area.
Conclusions
Herein, presented four viable and propagated adaptation strategies are presented to support populations in sub-Saharan Africa in their development of climate-resilience. These projects are united by their careful alignment of design research, early involvement of stakeholders and decision-makers, and scientific evaluation of health outcomes as well as economic returns. Global climate change mitigation efforts are certainly needed. Still, climate change impacts on health are already discernible in rural Burkina Faso and Kenya. These transformative projects will enhance the local adaptive capacities for combatting the major health problems undernutrition, cardiovascular heat-stress, and malaria in these regions.
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Acknowledgments
This writing of this chapter has been supported by Prof. Rainer Sauerborn and Prof. Manuela De Allegri (Heidelberg Institute of Global Health (HIGH), Heidelberg University, Im Neuenheimer Feld 130.3 69120 Heidelberg, Germany) as well as Dr. Penelopé Vounatsou (Swiss Tropical and Public Health Institute, Socinstrasse 57 CH-4051 Basel, Switzerland).
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Yeboah, E. et al. (2021). Transformative Adaptations for Health Impacts of Climate Change in Burkina Faso and Kenya. In: Oguge, N., Ayal, D., Adeleke, L., da Silva, I. (eds) African Handbook of Climate Change Adaptation. Springer, Cham. https://doi.org/10.1007/978-3-030-45106-6_119
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