The adoption of renewable energy sources is an important step in combating climate change and promoting sustainable development
[1]
. This transformation has significant implications for energy development and achieving Sustainable Development Goals (SDGs) in Africa, a continent with unique energy challenges and opportunities. SDG 7, which aims to ensure access to affordable and clean energy, requires the adoption of renewable energy technologies
[2]
. However, this transition may have unintended consequences for other SDGs
[2]
. Effective climate finance strategies are required to support sustainable development efforts in Africa, and overcoming regulatory, institutional, and market barriers is critical
[3]
. Multinational energy companies use various tactics to integrate renewable energy, which impacts the economy, the environment, and society
[4]
. Despite progress in some regions, sub-Saharan Africa is still struggling to meet its renewable energy target
[3]
. To address these challenges, sub-Saharan African nations must develop and implement effective renewable energy policies tailored to each region’s specific context and needs
[5]
. The study adopted a multidisciplinary approach to evaluate the association between African energy policies, environmental initiatives, and sustainable growth. It is widely recognized that modifications in energy systems are essential for reducing greenhouse gas emissions and achieving Sustainable Development Goals (SDGs). However, these changes may not be sufficient to address the specific objectives of affordable and clean energy and climate action in Africa
[6]
. The transition towards renewable energy sources could result in unforeseen environmental consequences and hinder progress toward specific SDGs
[7]
. Furthermore, although green taxes may offer benefits for environmental protection and revenue generation
[8]
, they could also exacerbate inequality and energy poverty, which could undermine other SDGs.
Increasing global population and economic activities have raised concerns about the sustainability of resource management and environmental impacts
[9]
[10]
. Advancements in solar power, wind energy, electromobility, and energy efficiency present challenges for energy and water systems
[8]
. As a result, various studies have explored potential scenarios for the global energy transition and the material-energy nexus
[11]
-
[14]
. The increasing demand for Minerals required for human activities may necessitate additional mining activities and higher energy requirements in producing countries
[15]
. It is crucial to implement robust policies, investments, and sustainable infrastructure to promote the development of green energy and stimulate economic growth
[16]
. However, extracting minerals for energy transition may pose risks and trade-offs that can harm the environment and displace local populations. Although Africa is rich in mineral resources, poor management has hindered sustainable socio-economic development
[17]
. African countries face varying levels of access to energy, with some regions, such as North and South Africa, having clean and electrified energy, while West Africa lacks access to electricity for millions of inhabitants
[17]
. Additional measures beyond energy policies may be necessary to achieve the energy transition objectives in Africa
[3]
. The main focus of this study is on the scenarios that may occur in mineral-producing countries regarding supply.
Addressing climate change impacts in sub-Saharan Africa highlights the importance of resilience strategies to mitigate extreme weather events and achieve Sustainable Development Goals
[18]
. Inefficient resource allocation and mismanagement during mineral extraction can impede sustainable development in Africa
[3]
. Obtaining and preserving energy and mineral resources is essential for economic growth and improved living standards, although increased mineral production may conflict with energy and water resource conservation efforts
[12]
. Adopting a nexus approach that explores the interrelationships among energy, minerals, ecology, economy, and society can aid in identifying energy and material exchanges across regions. Research on energy technologies’ mineral and climatic implications is vital for promoting sustainable growth in Africa.
This study aims to 1) evaluate the current mineral and energy demands, analyze the implications of the global energy transition on mineral supply, and 2) assess the consequences of rising mineral demand on energy and water requirements in Africa. This study 3) examined the impact of transitioning to renewable energy sources on achieving sustainable development goals (SDGs) and mitigating climate change in Africa. This study offers essential information to policymakers and development planners for areas that require immediate attention and contributes to the scientific understanding of the impact of the global energy transition on energy development and climate change in Africa. The structure of the paper is as follows: The introduction and literature review present the background and objectives. Section 2 provides information on the study area, the analysis strategy, and the methods employed for data collection. Section 3 presents and discusses the results, and the conclusion closes the study.
2. Literature Review
Minerals, energy, water, and climate have attracted significant scholarly interest in Africa’s sustainable development
[14]
. Studies emphasize the importance of water, energy, and food security interdependencies for sustainable development, particularly as climate change threatens these sectors
[3]
[14]
. The Horn of Africa faces challenges in achieving Sustainable Development Goals related to hunger, clean water, and affordable clean energy
[19]
. Transitioning to renewable energy is crucial for attaining clean energy and climate action goals, positively affecting the economic, environmental, social, and institutional aspects of Africa
[20]
. Investigating the connection between renewable energy and poverty reduction is a primary research focus that shapes sustainable energy development and resource policies across nations. Mineral extraction, particularly in sub-Saharan Africa, significantly impacts the environment through greenhouse gas emissions, necessitating sustainable industrial practices
[21]
-
[24]
. Despite the correlation between industrial growth and increased CO2 emissions, adopting renewable energy and efficient technologies can mitigate these effects
[25]
. The energy-intensive nature of mineral processing exacerbates environmental degradation, and countries with abundant minerals face the challenge of balancing economic development with environmental concerns
[3]
. The interplay among energy consumption, economic growth, and carbon emissions highlights the need for eco-friendly extraction methods and stringent environmental regulations. Economic growth driven by Africa’s energy transition can help reduce the environmental impact of energy use, emphasizing the importance of focusing on economic growth and productive energy usage
[26]
[27]
. Adopting circular economy principles is recommended to address environmental, social, and economic challenges and advance Sustainable Development Goals (SDGs)
[28]
. Renewable energy adoption improves air quality and contributes to achieving sustainable development targets, particularly for poverty alleviation
[29]
. Advancing is increasingly emphasized across various sectors, including energy, business growth, poverty reduction, and information and communication technology.
The energy sector, particularly water infrastructure, consumes significant electricity in regions such as South Africa, where load shedding manages the electricity demand
[3]
. Transitioning to renewable energy is vital for reducing environmental impacts and achieving Sustainable Development Goals (SDGs) related to clean energy, economic growth, and climate change
[30]
[31]
. The water-intensive nature of mineral extraction requires decoupling from energy systems to ensure energy security and sustainability
[32]
. Policy, fiscal measures, and governance are crucial to achieving health and environmental sustainability in the mineral extraction sector. Africa’s mineral extraction industry is complex and sustainable practices are essential for balancing industrial growth with environmental sustainability. Integrating renewable energy and climate change mitigation technologies is necessary to reduce greenhouse gas emissions and achieve the SDGs related to climate change, clean energy, industry, innovation, and infrastructure. Sustainable mineral extraction and energy consumption practices are vital for mitigating the impacts of climate change in Africa and for achieving sustainable development goals. Appendix
Table A1
presents studies on mineral requirements in energy technology, SDG implementation, and the need for a nexus approach to decision-making and policy development.
3. Study Area and Methodology3.1. Boundary Descriptions
The mining industry in sub-Saharan Africa is an interesting topic, with studies focusing on various aspects such as mineral dependence, energy consumption patterns, and water use. The African continent is home to 80% of the world’s industrial minerals and metals, with the Congo, the Kalahari, and crystalline rocks being the most important cratons. Countries such as the Democratic Republic of Congo, Guinea, Mozambique, South Africa, Zambia, and Zimbabwe were selected for their significant mineral deposits and energy technology needs (
Figure 1
). However, the sustainable development of the mining sector in these countries remains a subject of debate and concern due to the resource-intensive nature of the industry and its impact on the environment and local communities
[33]
. Africa is rich in natural resources and has significant potential for renewable energy and sustainable development, making it a key player in the global energy transition and the Sustainable Development Goals. To address climate change and support sustainable development, effective climate finance strategies are required to support renewable energy projects in Africa
[34]
[35]
. The present study did not include the artisanal mining operating process. Instead, the assessment focuses on industrial mineral extraction and supply steps because the refining process is mainly outside (
Table A2
).
Figure 1. Study areas.
3.2. Collecting Minerals Demand, Energy, Water, and CO<sub>2</sub> Data
Forecasts for renewable energy production, primarily from wind and solar energy, point to significant growth from 400 to 12,000 TWh by 2035 and 25,000 TWh by 2050, as reported by Vidal et al.
[36]
. This increase in energy production is expected to lead to an increase in demand for metals such as aluminum (310 million tons), copper (40 million tons), steel (3200 million tons), and other minerals
[37]
. Demand for these resources is expected to increase by an average of 5% to 18% annually over the next 40 years
[36]
. The current annual increase in global demand for ferrous, base, and minor metals, which amounts to around 5%, is being driven by both developed and developing countries, resulting in a surge in demand that is expected to further increase production levels. However, additional work is needed to estimate the amount of global mineral resources needed to support the growth of energy technology and infrastructure
[38]
.
This study proposed a predictive model based on the estimated growth rates of minerals proposed by Vidal et al.
[36]
. To further validate the robustness of the model, the study planned to conduct three scenario analyses to assess the environmental impact of different levels of growth in global mineral demand. Specifically, the analyses examined a minimum increase of 5%, a maximum increase of 18%, and an average increase of 12% in annual mineral demand. These projections correspond to projected values for 2050 and provide a comprehensive understanding of the potential range of environmental impacts associated with different growth rates (
Figure 2
).
Figure 2. Flow chart of the research methodology.
By conducting these scenario analyses, this study can assess the sensitivity of the predictive model to different rates of mineral demand growth and provide valuable insights to policymakers and stakeholders on how to manage the environmental impacts of increased mineral demand, as shown in
Table A3
. This method is comparable to the work of Slameršak et al.
[39]
, who developed three different EROI scenarios to illustrate a range of potential transitions, considering energy consumption and CO2 emissions from the extraction-to-refining boundary. Although historical information regarding mineral market share can be beneficial for predicting future trends, it is crucial to consider factors such as market dynamics, technological advancements, and changes in consumer behavior that may affect the predictive accuracy of historical data. In this study, the 2020 market share was used to estimate the future African mineral supply (
Figure 3
), and a constant value for mineral reserves in 2020 was considered to calculate the years of mineral reserve production and anticipate the influence of growth in annual mineral demand on yearly production levels.
Meeting the increased demand for Minerals associated with the energy transition takes much work. The need for energy related to the extraction process was determined based on the annual mineral production using the above three minerals’ scenarios from 2020 to 2050.
Table 1
summarizes the energy allocated to mining compared to the current energy use from different sources (hydropower, solar, wind, gas, and oil).
Figure 3. African market share in mineral supply (<xref ref-type="bibr" rid="scirp.135487-https://www.statista.com/">
https://www.statista.com/
</xref>).
<xref ref-type="bibr" rid="scirp.135487-"></xref>Table 1. Energy capacity and CO<sub>2</sub> emissions in 2018 and 2019 energy share to mining in the selected countries.
Energy
Zimbabwe
Zambia
South Africa
Mozambique
Guinea
DR Congo
Production (TWh)
6800
11,550
234,500
18,390
598
9050
Local Consumption (TWh)
7120
11,040
207,180
11,570
556.10
7430
CO2 Emission (mt)
12.27
7.74
433.25
6.64
3.12
2.20
Share of Mining (TWh)
260
2400
6900
160
1500
5600
Numbers of Mining
3
10
33
3
2
13
Source:
https://www.worlddata.info/africa
[40]
.
Finally, the producer countries’ future energy needs for additional local mineral extraction or processing were estimated based on the energy conventionally required to extract or produce one unit of metal
[40]
-
[43]
. The energy demand for achieving SDGs based on each selected country’s energy per capita and the population growth rate was obtained from the World Bank and IEA
[44]
[45]
reports. This demand was then compared to the energy consumed in mineral extraction to determine the challenges linked to their SDGs and the existing energy, capacity of Africa.
In this study, data collection on water use in mineral extraction or processing was focused on bauxite, Co, Cu, Li, Mn, and Pt (
Table 2
) because information on the specific amount of water used to extract or produce Cr, graphite (a crystalline form of carbon), and phosphate rock was not available. The water demand for mineral extraction and production in each scenario was estimated and expressed as the increase in water until 2050.
<xref ref-type="bibr" rid="scirp.135487-"></xref>Table 2. Average annual water consumption.
Minerals
Average water used (m3/t)
Processing stages
Bauxite
0.447
Processed ore
Lithium
2,200
Cobalt
208.4
Concentrate
Copper
43.235
Manganese
1.404
Platinum
313,496
Source:
[46]
.
Mining operations often necessitate using engines, fuels, and extraction equipment that release CO2
[47]
[48]
. Therefore, this study focuses primarily on the CO2 emitted during mineral extraction from the deposit to estimate the yearly increase in CO2 emission based on the rise in annual mineral demand according to the proposed scenarios (
Table 3
).
<xref ref-type="bibr" rid="scirp.135487-"></xref>Table 3. CO<sub>2</sub> emissions from mineral extraction.
The following section reports and discusses the effects of the global energy transition on Africa’s mineral supply and the possible consequences on energy, water, and climate change.
4.1. Cumulative Mineral Demand in the Global Energy Transition
Figure 4
provides a comprehensive summary of the anticipated escalation in the cumulative mineral demand for bauxite, chromium, Co, Cu, graphite, Li, Mn, phosphate rock, and Pt, based on the three scenarios. The results highlight an increased demand for bauxite, phosphate rock, chromium, manganese, cobalt, copper, graphite, and lithium following closely behind. These findings are consistent with the results presented in
Table A4
and align with the projections reported by Koning et al.
[55]
for the increase in metal demand from 2011 to 2060 under the BAU, Techno, BMES, and REM 2050 scenarios.
The analysis revealed that the cumulative demand for bauxite, phosphate rock, chromium, and manganese by 2050 ranges from 27,500 to 400,000 teragrams (Tg), 17,832 to 264,599 Tg, 3270 to 48,510 Tg, and 1412 to 20,947 Tg, respectively. In the 12% and 18% scenarios, the global cumulative mineral demand for all minerals,
(a)--(b)--(c)--(d)--(e)--(f)--
(a)--(b)--(c)--(d)--(e)--(f)--
(a)--(b)--(c)--(d)--(e)--(f)--
(a)--(b)--(c)--(d)--(e)--(f)--
(a)--(b)--(c)--(d)--(e)--(f)--
(a)--(b)--(c)--(d)--(e)--(f)--
(a)--(b)--(c)--(d)--(e)--(f)--
(g)
(h)<p class="imgGroupCss_v"><img class=" imgMarkCss lazy" data-original="https://html.scirp.org/file/6401848-rId26.jpeg?20240826015635" /></p>(i)Figure 4. Global minerals demand as a result of energy transition.
except for Co, Cr, graphite, Mn, and Pt, is estimated to range from 79,000 Tg to 167,000 Tg by 2060
[56]
. Therefore, considering mineral production from 2020 to 2050, all mineral demand is projected to increase by between 432% and 14,337%. This finding in the 12% scenario (432% increase in mineral demand) is consistent with Watari et al.
[57]
, who stated that the energy transition could potentially result in a 200% - 900% increase in the total material requirement (TMR) flows related to mineral production in the electricity sector and a 350% - 700% increase in the transport sector by 2050.
4.2. The Impacts of the Energy Transition on African Mineral Supplies
Figure 5
shows the growth in yearly mineral production owing to the increasing
(a)--(b)--(c)--(d)--(e)--(f)--
(a)--(b)--(c)--(d)--(e)--(f)--
(a)--(b)--(c)--(d)--(e)--(f)--
(a)--(b)--(c)--(d)--(e)--(f)--
(a)--(b)--(c)--(d)--(e)--(f)--
(a)--(b)--(c)--(d)--(e)--(f)--
(a)--(b)--(c)--(d)--(e)--(f)--
(g)
(h)<p class="imgGroupCss_v"><img class=" imgMarkCss lazy" data-original="https://html.scirp.org/file/6401848-rId35.jpeg?20240826015638" /></p>(i)Figure 5. African mineral supply between 2020 and 2050.
demand for energy capacity systems. The data show an increase in all selected mineral supplies, which is projected to rise annually. However, political instability and collapse can hinder this growth.
Table 4
was analyzed in this study to examine the duration of mineral reserve availability using the 2020 mineral production data for Africa. Furthermore, the cumulative demand for minerals projected for 2050 is compared to determine the percentage of reserve usage by 2050. The results indicate that minerals such as lithium, cobalt, chromium, copper, and bauxite are being overexploited, with depletion rates of 156%, 836%, 2674%, 1245%, and 33579%, respectively. It is projected that additional reserves of these minerals will be needed by 2050, except for platinum, phosphate rocks, and graphite. Phosphate rocks, which are primarily used in agriculture as fertilizers and are aligned with the Sustainable Development Goals (SDGs), will experience the highest demand in scarce regions. In energy technologies, P2O5 is required, and Boer et al.
[58]
estimated a global demand of 43 million tons per year. Consequently, our study suggests that the exploitation year projections for all minerals are affected by the indicated scenarios. Valero et al.
[59]
also state that scarce regions will experience the highest demand for phosphate rocks.
<xref ref-type="bibr" rid="scirp.135487-"></xref>Table 4. African current reserves and production, the number of years that reserve could last under current production, cumulative demand for minerals, and % of the reserve used under the energy transition in the 18% scenario.
Minerals
2020 Reserves1(MT)
2021 Annual production (MT)
Lifespan (Years)2
Cumulative demand for each mineral (MT)
Mineral reserve by 20503 (%)
Lithium
220,000
1,200
184
342,385
156
Platinum
64,200
145
443
34,899
54
Graphite
69,000,000
152,650
452
50,742,569
74
Copper
52,000,000
2,630,000
31
647,195,642
1,245
Manganese
714,000,000
12,140,000
74
3,076,909,823
431
Chromium
200,000,000
18,000,000
12
5,347,719,859
2,674
Phosphate rock
56,780,000,000
73,600,000
772
17,298,881,809
31
Bauxite
7,400,000,000
85,000,000
88
2,484,840,000,000
33,579
Cobalt
3,613,000
124,800
34
30,202,463.29
836
1 (USGS, 2020), 2 the average number of years that a reserve can last under current production, 3% of the reserve used under the energy transition; MT: metric tons
[60]
.
<xref ref-type="bibr" rid="scirp.135487-"></xref>4.3. The Impacts of Mineral Supply on Energy, Water, and Carbon Emissions
Figure 6
summarizes the cumulative and total energy requirements for the preliminary processing benchmarks, mining plans, and processing costs for bauxite, Pt, phosphate, metallic Mn and Cr, Cu oxide, Co carbonate, and graphite. The
(a)--(b)--(c)--(d)--(e)--Figure 6. Energy is required for mineral processing. NB: The mining plan and processing costs established the African mining extraction methods [61].
(a)--(b)--(c)--(d)--(e)--Figure 6. Energy is required for mineral processing. NB: The mining plan and processing costs established the African mining extraction methods [61].
(a)--(b)--(c)--(d)--(e)--Figure 6. Energy is required for mineral processing. NB: The mining plan and processing costs established the African mining extraction methods [61].
(a)--(b)--(c)--(d)--(e)--Figure 6. Energy is required for mineral processing. NB: The mining plan and processing costs established the African mining extraction methods [61].
(a)--(b)--(c)--(d)--(e)--Figure 6. Energy is required for mineral processing. NB: The mining plan and processing costs established the African mining extraction methods [61].
energy required for primary mineral processing is likely to significantly increase in the future.
Table 5
summarizes the annual energy consumption based on the minerals extracted only from the DR Congo, Mozambique, Namibia, the Republic of Guinea, South Africa, Zambia, and Zimbabwe. Due to steady progress in their respective energy sectors, South Africa and Mozambique are prominent electricity producers. In 2020, South Africa had estimated wind and solar capacities of 515 megawatts (MW) and 3061 MW, respectively, whereas in 2019, Mozambique had a hydropower capacity of 2375 MW.
<xref ref-type="bibr" rid="scirp.135487-"></xref>Table 5. Recapitulative of the energy consumed yearly for mineral extraction of the selected African countries for the 2019 and 2021.
Minerals
Energy consumed (TWh)/2019
Energy consumed (TWh)/2021
Countries
Bauxite
4.92
5.1
Guinea
Manganese
44
0.6
South Africa
Phosphates
0.1
0.1
DR Congo
Platinum
0.0000169
0.0000169
Zimbabwe
0.00000195
0.00000195
South Africa
Cobalt
0.632
0.76
DR Congo
Titanium
12.3
15
South Africa
8.85
14.5
Mozambique
Copper
1.82
2.1
DR Congo
1.11
0.5
Zambia
Chromium
0.82
0.9
South Africa
Lithium
0.051
0.04
Namibia
Graphite
0.1
0.03
Mozambique
Most of the energy produced by these countries is consumed, leading to considerable GHG emissions
[62]
. South Africa, with its heavy reliance on coal-fueled power stations, contributes significantly to the country’s high GHG emissions, accounting for 93% of electricity generation. Despite efforts to shift towards a low-carbon economy, reducing coal consumption and CO2 emissions remains a difficult task
[61]
[63]
.
According to these findings, each cumulative mineral estimate possesses a considerable amount of energy. Based on the current three-scenario model, the projected total energy required to process these nine minerals is anticipated to reach 12,316 - 182,748 TWh by 2050. This study indicates that there is a substantial increase in yearly energy, water usage, and GHG emissions during mineral extraction (
Figure 7
). Considering the 12% scenario (annual average mineral demand), the estimated total energy required for mineral extraction was 402 TWh by 2050. As of 2020, the current operational African energy capacity has been estimated to be 0.058 TWh, with a total capacity of 0.375 TWh
[64]
. Additionally, the REMAP IRENA scenario projects an energy demand of 3561 TWh for all sectors in Africa by 2050. These values suggest that the energy used for mineral extraction surpasses current African energy usage. If the energy needed for population growth (207 TWh) is added to the energy required for mineral extraction (402 TWh), the combined total energy will account for 17% of the projected energy demand (3561 TWh) in 2050. Thus, the energy required for mineral processing is approximately 50,365 TWh by 2050 (using the 12% scenario), which is equivalent to 1414% of the energy demand projected by IRENA by 2050. It is important to note that mineral processing is not currently taking place in Africa, although only South Africa and Mozambique produce Al from bauxite.
The results also revealed that by 2050, only the mining processes of bauxite, chromium, cobalt, and copper are expected to emit less carbon dioxide than other minerals. However, the water volume necessary for extracting graphite, chromium, and phosphate rocks was not considered in this study. Nevertheless, the data indicate that the estimated range of water volume required is between 15,000 and 223,000 million cubic meters. Compared to previous studies, such as that of Slameršak et al.
[39]
, which examined 14 energy pathways of the EROI scenario and reported a global range of 185 - 290 GtCO2 emissions, our estimates were significantly lower. Specifically, our estimates for the ten minerals ranged from 1.34 × 10−3 to 1.96 × 10−2 GtCO2 emissions (1318 to 19,561 GgCO2). While these values may seem small compared to global emissions, they can still be considered significant locally, particularly in areas where mineral extraction is prevalent.
(n)<p class="imgGroupCss_v"><img class=" imgMarkCss lazy" data-original="https://html.scirp.org/file/6401848-rId55.jpeg?20240826015639" /></p>(o)<xref ref-type="bibr" rid="scirp.135487-"></xref>Figure 7. Impacts of the mineral supply on energy, water, and CO<sub>2</sub> emissions in each scenario.
4.4. The Effects of SDGs on Energy Demand in Africa
Figure 8. The total annual increase in energy demand for the sustainable development goals achievement.
5. Discussions
The pressing need for a global shift towards renewable energy sources underscores the importance of addressing the mineral demand that supports sustainable energy development. Research indicates that insufficient reserves of critical minerals can impede energy transition
[13]
[66]
. Therefore, it is essential to understand the intricacies of renewable energy adoption and mineral demand to establish effective policies for sustainable energy and transition. Africa presents promising prospects for enhancing renewable energy sources, which can bolster the economy and facilitate the transition to efficient and sustainable energy systems
[67]
. It is vital to ensure that energy development aligns with environmental sustainability to achieve Sustainable Development Goals (SDGs) and advance energy transitions. The shift towards renewable energy sources in Africa has affected the continent’s mineral resources. Africa holds significant reserves of critical minerals that are crucial for renewable energy technologies. However, challenges such as socio-ecological consequences and community displacement arise because of the pursuit of critical minerals for economic competitiveness and environmental sustainability. Moreover, decreasing ore grades and geopolitical barriers threaten the critical mineral supply chain. Research suggests that the growing production of renewable energy is increasing the demand for mineral imports (
Table A5
), indicating a reliance on Africa’s mineral resources
[68]
[69]
. Balancing economic demand with environmental concerns and sustainable governance is crucial for achieving sustainable development goals (SDGs) and advancing energy transition. Efforts must be made to assess trade-offs and potential risks associated with mineral extraction, energy consumption, and environmental consequences. Research has examined the carbon footprint of water services in urban systems, drawing attention to the significant energy consumption from fossil fuels
[63]
[70]
. The interdependence of regional trade, energy, water consumption, and carbon emissions underscore the need for an equitable approach to resource management. Challenges, such as climate change and extreme weather events, pose threats to energy systems and demand, highlighting the importance of developing strategies for adaptation and resilience. Balancing energy development with environmental sustainability is critical for achieving the Sustainable Development Goals (SDGs). Industrialized nations prioritize mineral procurement to regulate the market and meet their needs. Strategies for mineral extraction and supply should strive to minimize the long-term environmental consequences. The adoption of sustainable climate policies is recommended for low-income African countries to address the trade-off between energy resources and environmental threats. Addressing environmental challenges is crucial for sustainable development in sub-Saharan Africa. Further research is needed on the nexus approach and role of institutions in facilitating sustainable development. Empirical research on the effectiveness of cross-sectoral approaches and the incorporation of climate risk management into global development policies is essential.
6. Conclusion
This study delves into the complex relationships among minerals, energy, water, and climate across various African countries. As sustainability has emerged as a pressing global concern, Africa faces numerous challenges and opportunities in the energy sector and climate change arena. The findings of this study align with those of previous research, which projects the global mineral demand to range from 79,000 Tg to 167,000 Tg by 2060. The results indicate that minerals such as lithium, cobalt, chromium, copper, and bauxite are being overexploited, with depletion rates of 156, 8360, 26,740, 1245, and 335,790%, respectively. Phosphate rocks, which are widely utilized in agriculture as fertilizers and are aligned with the Sustainable Development Goals (SDGs), will experience the highest demand in regions where resources are scarce. In energy technologies, P2O5 is required, and a study has estimated a global demand of 43 million tons per year. As mineral extraction increases and considering the 12% scenario (annual average mineral demand), the estimated total energy required for mineral extraction is 402 TWh by 2050. Although producer countries strive to mine minerals locally, the estimated overall energy needed to process the minerals examined in this study is projected to be 50,365 TWh by 2050 (using the 12% scenario), which is roughly 1414% of the energy demand projected by IRENA for 2050. Despite a scarcity of data on water utilized for Cr, graphite, and phosphate rock extraction, the study found that millions of cubic meters of water will be required, and while the value of GHG emissions seems relatively small compared to global emissions, it is substantially significant locally, especially in areas where mineral extraction is prevalent. Meeting the requirements of SDG7 in Africa and accommodating population growth will likely lead to an increase in energy demand by 9 TWh/year. The lack of empirical research on the efficiency of cross-sectoral strategies and the role of institutions in facilitating nexus approaches in the context of sustainable development in Africa are pressing issues that require immediate attention. Future studies should consider the ethical implications of adaptation measures, and integrate climate risk management into global development policies. Currently, most studies concentrate on regional scales; however, there is an urgent need for research that examines the challenges at various spatial scales and resolutions, while simultaneously addressing the complexities of competition within nexus systems and the uncertainties associated with data and models.
Acknowledgments
We acknowledge all the data centers for providing free access to all datasets used in our study.
Appendix
<xref ref-type="bibr" rid="scirp.135487-"></xref>Table A1. Studies exploring the resource nexus.
Authors
Key summaries
[71]
This study suggests adopting new economic, technological, and social practices to achieve sustainable consumption and production. This study rethinks its approach by integrating energy and resource systems and considering government regulations and financial incentives. This includes promoting renewable energy technologies and incorporating the resource-energy-water nexus into product design. Moving towards sustainability requires these efforts.
[72]
This study highlights the significance of research in addressing challenges and emphasizes the importance of inclusive development and improved international relations to successfully implement the SDGs. Those using a nexus approach should prioritize academic rigor in their data, evidence, and modeling and disseminate, upscale, and generalize their findings through various fora and scales.
[2]
This study explored the interconnectedness between water, energy, food, greenhouse gases, waste, pollution, and land and the practical implications of addressing these issues for sustainable development. It also discusses the challenges of defining the nexus concept, which has become a popular buzzword. Standardizing the understanding of the nexus, such as quantifying its impact, can help achieve development goals.
[9]
This study examined how Energy Generation technologies will develop in China and what metals are required for their components. It quantifies the demand for 18 metals, compares it with global and Chinese production and reserves, and discusses metal flows and stocks, PV solar technology scenarios, market share, recycling, and IEA scenarios. The study found that there is a significant demand for metals to meet global temperature increase goals and highlights concerns about the availability and production capacity of certain metals. This suggests that future energy models should consider the energy-material nexus for successful implementation.
[12]
This study examined the relationship between Energy Transition Models, energy, water, and CO2 emissions, and material efficiencies in addressing climate change. The research finds that a higher Energy Generation Transition leads to increased emissions, especially in scenarios with high EGT transitions, such as the IEA SD and GP ADV-REV scenarios. However, the analysis emphasizes the need for regional analysis and evaluation of circular economy business models to fully understand the potential for climate change mitigation in global energy-transition scenarios.
[73]
This study used a quantitative approach to evaluate China’s energy transition constraints from a material cycle viewpoint. They calculated the demand for critical Minerals in the solar power sector, revealing a scarcity and supply risk, and found that wind power development requires 10% of China’s current reserves of Neodymium and Dysprosium. Thus, China should consider adjusting its renewable energy pathways based on critical mineral endowment and pursuing international trade and material efficiency improvement to support future renewable energy needs.
[74]
This study used a bottom-up energy model to estimate metal requirements for various technologies, including hydrogen and climate policy scenarios, based on assumptions about future metal intensities, recycling rates, and the lifespan of energy technologies. The results show that achieving 100% renewables, coal and nuclear, and gas and renewables pathways has similar warming levels without climate policy, but peak emissions occur within a few decades with a 2˚C policy. This study highlights the critical role of vanadium in all outcomes, and the use of an energy model to study the energy-mineral nexus provides valuable insights for decision-making and policy development.
[75]
This study emphasized the significance of scarce mineral and metal resources in the transition to green energy. It categorizes and ranks 17 critical minerals based on availability, with low indices for key battery minerals, such as cobalt, graphite, and lithium. Enhanced calculation methods were employed to predict demand-supply scenarios for these commodities until 2050, revealing high uncertainty in the forecasted projections.
[76]
This study investigated the effects of renewable energy and globalization on sustainable development in 24 African countries between 1990-2015. This reveals that renewable energy consumption promotes sustainable development, especially in countries that have made moderate progress on the sustainable development agenda. However, these countries must significantly decrease their non-renewable energy consumption. Global collaboration in green policy innovation and research is essential for unlocking SSA’s potential of SSA for renewable energy, focusing on making renewables more affordable than fossil-based energy sources to achieve sustainable development goals.
Continued
[3]
This research assessed climate finance strategies for renewable energy development in Africa by examining the challenges and effectiveness of initiatives and financial instruments. It also explores success stories and international climate goal alignment to guide policymakers and stakeholders in refining strategies for a more impactful renewable energy transition in Africa.
[72]
Tensions rise along the Nile River as Ethiopia constructs the Grand Ethiopian Renaissance Dam. Egypt is concerned about water shortages and is considering sanctions, while Ethiopia is seeking to increase its electricity supply. The United Nations Security Council recommends discussions with the African Union. This article explores the connection between water and energy in international relations, offering constructive perspectives to address energy systems, water management, and food security in future negotiations and institution-building initiatives.
[77]
Recycling is debated for environmental and resource conservation reasons; however, its effectiveness is questionable. Mining is facing declining ore grades, while recycling is hindered by material dispersion into products or waste, increasing the effort required. Determining the optimal recycling rate by optimizing the overall recycling system is crucial. Establishing political goals for a Circular Economy is necessary before this can be achieved.
<xref ref-type="bibr" rid="scirp.135487-"></xref>Table A2. Impact linking to mineral production technologies.
Minerals
The energy required for production
Extraction methods
Associated impacts
References
Bauxite
60 kWh/t
Open-pit/Electrowinning
Loss of habitat and food for local wildlife
[40]
Platinum
130 kWh/t rock
Open-pit/Underground mining/Electrowinning
High waste rock and tailings generated (98% of the ore becoming tailings), High electricity consumption (average 175 GJ/kg PGM), water usage (average 400 m3/kg PGM), and CO2 emissions (average 40 t CO2e/kg PGM.)
[40]
Pure Titanium sponge
15,000 kWh/t Products
Vacuum distillation
Removal of vegetation cover and topsoil, massive amounts of water
[51]
Phosphate
50 kWh/t Products
Mining with draglines (waste to ore ratio 1:1) and slurry pumping to the beneficiation plant
Polluted air, contaminated water, and destruction of valuable wildlife habitat
[40]
Manganese metal from reduced or sintered ore
80 kWh/t manganese ore
Open-pit/Electrolysis of aqueous solution (Nelspruit process)
Can cause toxicity and deficiency symptoms in plants and humans
[40]
Chromite ore
48 kWh/t
Open-pit/Electrolysis
Health effects negatively affect plant metabolic activities, hampering crop growth and yield and reducing vegetable and grain quality.
[40]
Copper oxide ores and sulfide ores
1400 kWh/t Cu
Open-pit/Electrowinning
It affects drinking water aquifers, contaminates farmland, contaminates and loss of fish, wildlife, and their habitat, and risks to public health.
[40]
Cobalt carbonate from primary sources
6322 kWh/t
Open-pit/Electrowinning
Cause vision problems, vomiting and nausea, heart problems, and thyroid damage.
[42]
Natural graphite
1000 kWh/t
Surface/underground mining
Loss of habitat and pollution, contamination of surface and groundwater
[78]
Lithium
32,000 kWh/t
Electrolysis
Water depletion, ground destabilization, biodiversity loss, increased salinity of rivers, contaminated soil, and toxic waste
[78]
<xref ref-type="bibr" rid="scirp.135487-"></xref>Table A3. The annual projection of mineral demand in each scenario by 2050 (in metric tons).
Minerals
2020 Global mineral production (USGS 2020)
5%
12%
18%
Graphite
1,155,000
4,991,843
36,910,624
1.86E+08
Copper
2.10E+07
9.1E+07
6.71E+08
3.38E+09
Manganese
2.00E+07
8.6E+07
6.38E+08
3.21E+09
Chromium
4.62E+07
2E+08
1.48E+09
7.44E+09
Bauxite
3.89E+08
1.68E+9
1.24E+10
6,26E+10
Cobalt
147,000
635,326
4,697,716
23,684,829
Lithium
80,850
349,429
2,583,744
13,026,656
Platinum
189
953
7047
35,527
Phosphate rocks
2.52E+08
4,991,843
37E+6
1.86E+08
<xref ref-type="bibr" rid="scirp.135487-"></xref>Table A4. The annual projection of mineral demand found in studies.
Minerals
Previous study’s estimation (MT)
Periods
Authors
Bauxite
140E+6 - 215E+6
2010-2050
[79]
650E+3 - 9550E+3
2012-2050
[80]
5.58E+06
2019-2050
[75]
29E+6 - 100E+6
2018-2050
[69]
Chromium
3.66E+05
2019-2050
[75]
Cobalt
1300E+3 - 2200E+3
2015-2060
[81]
Copper
285E+3 - 1540E+3
2012-2050
[80]
Graphite
4.59E+06
2015-2050
[75]
Lithium
2.28E+6 - 16.74E+6
2015-2100
[82]
242E+3 - 2079E+3
2020-2050
[83]
1719E+3 - 2031E+3
2000-2100
[84]
Manganese
6.94E+05
2019-2050
[75]
Phosphate rocks
28E+6 - 50E+6
2011-2118
[85]
Platinum
6000 - 47,000
2007-2050
[86]
109 - 2541
2021-2050
[87]
<xref ref-type="bibr" rid="scirp.135487-"></xref>Table A5. Different technologies in which the minerals extracted are used in the energy transition <xref ref-type="bibr" rid="scirp.135487-69">
[69]
</xref>.
Minerals
Bauxite (Aluminum)
Chromium
Cobalt
Copper
Graphite
Lithium
Manganese
Phosphate rock
Platinum
Technologies
Transportation
Solar Photovoltaic (PV) Panels
Lithium-ion Batteries
Power Generation
Lithium-ion Batteries
Lithium-ion Batteries
Lithium-ion Batteries
Lithium Iron Phosphate (LiFePO4) Batteries
Fuel Cells
Packaging
Wind Turbines
Renewable Energy Storage
Wind Energy
Redox Flow Batteries
Electric Vehicles (EVs)
Renewable Energy Systems
Advanced Lead-Acid Batteries
Hydrogen Production
Construction
Energy Storage:
Solar Photovoltaics
Electrical Grids
Fuel Cells
Energy Storage Systems (ESS)
Hydrogen Production
Sodium-Ion Batteries
Renewable Energy Storage
Continued
Electrical Industry
Fuel Cells
Hydrogen Fuel Cells
Energy Storage
Solar Photovoltaic (PV) Cells
Portable Electronics
Carbon Capture and Storage (CCS)
Phosphoric Acid Fuel Cells (PAFCs)
Hydrogen Fueling Station
Consumer Electronics:
Hydrogen Production:
Wind Turbines
Electric Vehicles (EVs)
Nuclear Reactors
Renewable Energy Integration
Nuclear Power Generation
Phosphate Rock for Fertilizer Production
Offshore Wind Power
Renewable Energy:
Sustainable Infrastructure:
Electric Aerospace
Geothermal Systems
Thermally Conductive Materials
Smart Grids
Solar Energy
Marine Industry:
Hydro Power
Water Purification
Renewable Power Plants
Sports Equipment
Carbon Capture and Storage (CCS)
Medical Devices:
Coating and Lubrication
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