A review of renewable energy sources, sustainability issues and climate change mitigation

Abstract

The world is fast becoming a global village due to the increasing daily requirement of energy by all population across the world while the earth in its form cannot change. The need for energy and its related services to satisfy human social and economic development, welfare and health is increasing. Returning to renewables to help mitigate climate change is an excellent approach which needs to be sustainable in order to meet energy demand of future generations. The study reviewed the opportunities associated with renewable energy sources which includes: Energy Security, Energy Access, Social and Economic development, Climate Change Mitigation, and reduction of environmental and health impacts. Despite these opportunities, there are challenges that hinder the sustainability of renewable energy sources towards climate change mitigation. These challenges include Market failures, lack of information, access to raw materials for future renewable resource deployment, and our daily carbon footprint. The study suggested some measures and policy recommendations which when considered would help achieve the goal of renewable energy thus to reduce emissions, mitigate climate change and provide a clean environment as well as clean energy for all and future generations.

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CIVIL & ENVIRONMENTAL ENGINEERING | REVIEW ARTICLE
A review of renewable energy sources,
sustainability issues and climate change
mitigation
Phebe Asantewaa Owusu and Samuel Asumadu-Sarkodie
Cogent Engineering (2016), 3: 1167990

Owusu & Asumadu-Sarkodie, Cogent Engineering (2016),
3: 1167990
http://dx.doi.org/10.1080/23311916.2016.1167990
CIVIL & ENVIRONMENTAL ENGINEERING | REVIEW ARTICLE
A review of renewable energy sources, sustainability
issues and climate change mitigation
Phebe Asantewaa Owusu
1
and Samuel Asumadu-Sarkodie
1
*
Abstract:The world is fast becoming a global village due to the increasing daily
requirement of energy by all population across the world while the earth in its
form cannot change. The need for energy and its related services to satisfy human
social and economic development, welfare and health is increasing. Returning to
renewables to help mitigate climate change is an excellent approach which needs
to be sustainable in order to meet energy demand of future generations. The study
reviewed the opportunities associated with renewable energy sources which in-
cludes: Energy Security, Energy Access, Social and Economic development, Climate
Change Mitigation, and reduction of environmental and health impacts. Despite
these opportunities, there are challenges that hinder the sustainability of renewable
energy sources towards climate change mitigation. These challenges include Market
failures, lack of information, access to raw materials for future renewable resource
deployment, and our daily carbon footprint. The study suggested some measures
and policy recommendations which when considered would help achieve the goal of
renewable energy thus to reduce emissions, mitigate climate change and provide a
clean environment as well as clean energy for all and future generations.
Subjects: Bio Energy; Clean Tech; Clean Technologies; Environmental; Renewable Energy
Keywords: renewable energy sources; climate change mitigation; sustainability issues;
clean energy; carbon footprint; environmental sustainability engineering
*Corresponding author: Samuel
Asumadu-Sarkodie, Sustainable
Environment and Energy System, Middle
East Technical University, Northern
Cyprus Campus, Kalkanli, Guzelyurt
99738, TRNC, Turkey
E-mail: samuel.sarkodie@metu.edu.tr
Reviewing editor:
Shashi Dubey, Hindustan College of
Engineering, India
Additional information is available at
the end of the article
ABOUT THE AUTHORS
Phebe Asantewaa Owusu studies Masters in
Sustainable Environment and Energy Systems at
Middle East Technical University, Northern Cyprus
Campus where she is also a graduate assistant in
the Chemistry Department.
Samuel Asumadu-Sarkodie is a multidisciplinary
researcher who currently studies Masters in
Sustainable Environment and Energy Systems at
Middle East Technical University, Northern Cyprus
Campus where he is also a graduate assistant in
the Chemistry Department. His research interest
includes but is not limited to: renewable energy,
econometrics, energy economics, climate change
and sustainable development.
PUBLIC INTEREST STATEMENT
Energy is a requirement in our everyday life as a
way of improving human development leading to
economic growth and productivity. The return-to-
renewables will help mitigate climate change is
an excellent way but needs to be sustainable in
order to ensure a sustainable future and bequeath
future generations to meet their energy needs.
Knowledge regarding the interrelations between
sustainable development and renewable energy
in particular is still limited. The aim of the paper
is to ascertain if renewable energy sources are
sustainable and examine how a shift from fossil
fuel-based energy sources to renewable energy
sources would help reduce climate change and
its impact. A qualitative research was employed
by reviewing peer-reviewed papers in the area of
study. This study brought to light the opportunities
associated with renewable energy sources; energy
security, energy access, social and economic
development and climate change mitigation and
reduction of environmental and health impacts.
Received: 28 January 2016
Accepted: 15 March 2016
Published: 04 April 2016
© 2016 The Author(s). This open access article is distributed under a Creative Commons Attribution
(CC-BY) 4.0 license.
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Phebe Asantewaa Owusu

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1. Introduction
The world is fast becoming a global village due to the increasing daily requirement of energy by all
population across the world while the earth in its form cannot change. The need for energy and its
related services to satisfy human social and economic development, welfare and health is increas-
ing. All societies call for the services of energy to meet basic human needs such as: health, lighting,
cooking, space comfort, mobility and communication and serve as generative processes (Edenhofer
et al., 2011). Securing energy supply and curbing energy contribution to climate change are the two-
over-riding challenges of energy sector on the road to a sustainable future (Abbasi & Abbasi, 2010;
Kaygusuz, 2012). It is overwhelming to know in today’s world that 1.4 billion people lack access to
electricity, while 85% of them live in rural areas. As a result of this, the number of rural communities
relying on the traditional use of biomass is projected to rise from 2.7 billion today to 2.8 billion in
2030 (Kaygusuz, 2012).
Historically, the first recorded commercial mining of coal occurred in 1,750, near Richmond,
Virginia. Momentarily, coal became the most preferred fuel for steam engines due to its more energy
carrying capacity than corresponding quantities of biomass-based fuels (firewood and charcoal). It
is noteworthy that coal was comparatively cheaper and a much cleaner fuel as well in the past cen-
turies (Abbasi, Premalatha, & Abbasi, 2011). The dominance of fossil fuel-based power generation
(Coal, Oil and Gas) and an exponential increase in population for the past decades have led to a
growing demand for energy resulting in global challenges associated with a rapid growth in carbon
dioxide (CO2) emissions (Asumadu-Sarkodie & Owusu, 2016a). A significant climate change has be-
come one of the greatest challenges of the twenty-first century. Its grave impacts may still be avoid-
ed if eorts are made to transform current energy systems. Renewable energy sources hold the key
potential to displace greenhouse gas emissions from fossil fuel-based power generating and there-
by mitigating climate change (Edenhofer et al., 2011).
Sustainable development has become the centre of recent national policies, strategies and devel-
opment plans of many countries. The United Nations General Assembly proposed a set of global
Sustainable Development Goals (SDGs) which included 17 goals and 169 targets at the UN in New
York by the Open Working Group. In addition, a preliminary set of 330 indicators was introduced in
March 2015 (Lu, Nakicenovic, Visbeck, & Stevance, 2015). The SDGs place greater value and demands
on the scientific community than did the Millennium Development Goals. In addressing climate
change, renewable energy, food, health and water provision requires a coordinated global monitor-
ing and modelling of many factors which are socially, economically and environmentally oriented
(Hák, Janoušková, & Moldan, 2016; Owusu, Asumadu-Sarkodie, & Ameyo, 2016).
Research into alternate sources of energy dated back in the late 90s when the world started re-
ceiving shock from oil produces in terms of price hiking (Abbasi et al., 2011). It is evidential in litera-
ture that replacing fossil fuel-based energy sources with renewable energy sources, which includes:
bioenergy, direct solar energy, geothermal energy, hydropower, wind and ocean energy (tide and
wave), would gradually help the world achieve the idea of sustainability. Governments, intergovern-
mental agencies, interested parties and individuals in the world today look forward to achieving a
sustainable future due to the opportunities created in recent decades to replace petroleum-derived
materials from fossil fuel-based energy sources with alternatives in renewable energy sources. The
recent launch of a set of global SDGs is helping to make sure that climate change for twenty-first
century and its impacts are combated, and a sustainable future is ensured and made as a bequest
for future generations (Edenhofer et al., 2011; Lu et al., 2015).
Against this backdrop, the study seeks to examine the potentials and trends of sustainable devel-
opment with renewable energy sources and climate change mitigation, the extent to which it can
help and the potential challenges it poses and how a shift from fossil to renewable energy sources is
a sure way of mitigating climate change. To achieve this objective, concepts, techniques and peer-
reviewed journals are analysed and reviewed judiciously.

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The remainder of the paper is sectioned into five: Section 2 discusses renewable energy sources
and sustainability and climate change, Section 3 elaborates on the various renewable energy sourc-
es and technologies, Section 4 elaborates on the renewable energy sources and sustainable devel-
opment, Section 5 elaborates on challenges aecting renewable energy sources and policy
recommendations and Section 6 concludes the study.
2. Renewable energy sources and sustainability
Renewable energy sources replenish themselves naturally without being depleted in the earth; they
include bioenergy, hydropower, geothermal energy, solar energy, wind energy and ocean (tide and
wave) energy. The main renewable energy forms and their uses are presented in Table 1.
Tester (2005) defines sustainable energy as, “a dynamic harmony between the equitable availabil-
ity of energy-intensive goods and services to all people and preservation of the earth for future
generations”.
The world’s growing energy need, alongside increasing population led to the continual use of fossil
fuel-based energy sources (Coal, Oil and Gas) which became problematic by creating several chal-
lenges such as: depletion of fossil fuel reserves, greenhouse gas emissions and other environmental
concerns, geopolitical and military conflicts, and the continual fuel price fluctuations. These prob-
lems will create unsustainable situations which will eventually result in potentially irreversible threat
to human societies (UNFCC, 2015). Notwithstanding, renewable energy sources are the most out-
standing alternative and the only solution to the growing challenges (Tiwari & Mishra, 2011). In
2012, renewable energy sources supplied 22% of the total world energy generation (U.S. Energy
Information Administration, 2012) which was not possible a decade ago.
Reliable energy supply is essential in all economies for heating, lighting, industrial equipment,
transport, etc. (International Energy Agency, 2014). Renewable energy supplies reduce the emission
of greenhouse gases significantly if replaced with fossil fuels. Since renewable energy supplies are
obtained naturally from ongoing flows of energy in our surroundings, it should be sustainable. For
renewable energy to be sustainable, it must be limitless and provide non-harmful delivery of envi-
ronmental goods and services. For instance, a sustainable biofuel should not increase the net CO2
emissions, should not unfavourably aect food security, nor threaten biodiversity (Twidell & Weir,
2015). Is that really what is happening today? I guess not.
In spite of the outstanding advantages of renewable energy sources, certain shortcoming exists
such as: the discontinuity of generation due to seasonal variations as most renewable energy re-
sources are climate-dependent, that is why its exploitation requires complex design, planning and
control optimization methods. Fortunately, the continuous technological advances in computer hard-
ware and software are permitting scientific researchers to handle these optimization diculties using
computational resources applicable to the renewable and sustainable energy field (Baños et al., 2011).
Table 1. Renewable energy sources and their use (Panwar et al., 2011)
Energy sources Energy conversion and usage options
Hydropower Power generation
Morden biomass Heat and power generation, pyrolysis, gasification, digestion
Geothermal Urban heating, power generation, hydrothermal, hot dry rock
Solar Solar home systems, solar dryers, solar cookers
Direct solar Photovoltaic, thermal power generation, water heaters
Wind Power generation, wind generators, windmills, water pump
Wave and tide Numerous design, barrage, tidal stream

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2.1. Renewable energy and climate change
Presently, the term “climate change” is of great interest to the world at large, scientific as well as
political discussions. Climate has been changing since the beginning of creation, but what is alarm-
ing is the speed of change in recent years and it may be one of the threats facing the earth. The
growth rate of carbon dioxide has increased over the past 36years (1979–2014) (Asumadu-Sarkodie
& Owusu, 2016c, 2016f), “averaging about 1.4ppm per year before 1995 and 2.0ppm per year there-
after” (Earth System Research Laboratory, 2015). The United Nations Framework Convention on
Climate Change defines climate change as being attributed directly or indirectly to human activities
that alters the composition of the global atmosphere and which in turn exhibits variability in natural
climate observed over comparable time periods (Fräss-Ehrfeld, 2009).
For more than a decade, the objective of keeping global warming below 2°C has been a key focus
of international climate debate (Asumadu-Sarkodie, Rufangura, Jayaweera, & Owusu, 2015; Rogelj,
McCollum, Reisinger, Meinshausen, & Riahi, 2013). Since 1850, the global use of fossil fuels has in-
creased to dominate energy supply, leading to a rapid growth in carbon dioxide emissions. Data by
the end of 2010 confirmed that consumption of fossil fuels accounted for the majority of global an-
thropogenic greenhouse gas (GHG) emissions, where concentrations had increased to over 390ppm
(39%) above preindustrial levels (Edenhofer et al., 2011).
Renewable technologies are considered as clean sources of energy and optimal use of these re-
sources decreases environmental impacts, produces minimum secondary waste and are sustaina-
ble based on the current and future economic and social needs. Renewable energy technologies
provide an exceptional opportunity for mitigation of greenhouse gas emission and reducing global
warming through substituting conventional energy sources (fossil fuel based) (Panwar, Kaushik, &
Kothari, 2011).
3. Renewable energy sources and technology
Renewable energy sources are energy sources from natural and persistent flow of energy happening
in our immediate environment. They include: bioenergy, direct solar energy, geothermal energy,
hydropower, wind and ocean energy (tide and wave).
3.1. Hydropower
Hydropower is an essential energy source harnessed from water moving from higher to lower eleva-
tion levels, primarily to turn turbines and generate electricity. Hydropower projects include Dam
project with reservoirs, run-of-river and in-stream projects and cover a range in project scale.
Hydropower technologies are technically mature and its projects exploit a resource that vary tem-
porarily. The operation of hydropower reservoirs often reflects their multiple uses, for example flood
and drought control (Asumadu-Sarkodie, Owusu, & Jayaweera, 2015; Asumadu-Sarkodie, Owusu, &
Rufangura, 2015), irrigation, drinking water and navigation (Edenhofer et al., 2011). The primary
energy is provided by gravity and the height the water falls down on to the turbine. The potential
energy of the stored water is the mass of the water, the gravity factor (g=9.81ms−2) and the head
defined as the dierence between the dam level and the tail water level. The reservoir level to some
extent changes downwards when water is released and accordingly influences electricity produc-
tion. Turbines are constructed for an optional flow of water (Førsund, 2015). Hydropower discharges
practically no particulate pollution, can upgrade quickly, and it is capable of storing energy for many
hours (Hamann, 2015).
3.1.1. Hydropower source potential
Hydropower generation technical annual potential is 14,576 TWh, with an estimated total capacity
potential of 3,721GW; but, currently the global installed capacity of hydropower is much less than
it’s potential. According to the World Energy Council Report, about 50% of hydropower installed ca-
pacity is among four countries namely China, Brazil, Canada and USA (World Energy Council, 2013).
The resource potential of hydropower could be altered due to climate change. Globally, the altera-
tions caused by climate change in the existing hydropower production system are estimated to be

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less than 0.1%, even though additional research is needed to lower the uncertainties of these projec-
tion (Edenhofer et al., 2011).
3.1.2. Hydropower environmental and social impact
Hydropower generation does not produce greenhouse gases and thus mostly termed as a green
source of energy. Nonetheless, it has its advantages and disadvantages. It improves the socio-eco-
nomic development of a country; but, also considering the social impact, it displaces a lot of people
from their homes to create it, though they are compensated but are not enough. The exploitation of
the sites for hydropower such as, reservoirs that are often artificially created leading to flooding of
the former natural environment. In addition, water is drained from lakes and watercourses and
transported through channels over large distances and to pipelines and finally to the turbines that
are often visible, but they may also go through mountains by created tunnels inside them (Førsund,
2015). Hydroelectric structures aect river body’s ecology, largely by inducing a change into its hy-
drologic characteristics and by disturbing the ecological continuity of sediment transport and fish
migration through the building of dams, dikes and weirs (Edenhofer et al., 2011). In countries where
substantial plants or tree covers are flooded during the construction of a dam, there may be forma-
tion of methane gas when plants start rotting in the water, either released directly or when water is
processed in turbines (Førsund, 2015).
3.2. Bioenergy
Bioenergy is a renewable energy source derived from biological sources. Bioenergy is an important
source of energy, which can be used for transport using biodiesel, electricity generation, cooking and
heating. Electricity from bioenergy attracts a large range of dierent sources, including forest by-
products such as wood residues; agricultural residues such as sugar cane waste; and animal hus-
bandry residue such as cow dung. One advantage of biomass energy-based electricity is that fuel is
often a by-product, residue or waste product from the above sources. Significantly, it does not create
a competition between land for food and land for fuel (Urban & Mitchell, 2011). Presently, global
production of biofuels is comparatively low, but continuously increasing (Ajanovic, 2011). The annual
biodiesel consumption in the United States was 15 billion litres in 2006. It has been growing at a rate
of 30–50% per year to achieve an annual target of 30 billion litres at the end of year 2012 (Ayoub &
Abdullah, 2012).
3.2.1. Bioenergy source potential
Biomass has a large potential, which meets the goal of reducing greenhouse gases and could insure
fuel supply in the future. A lot of research is being done in this area trying to quantify global biomass
technology. According to Hoogwijk, Faaij, Eickhout, de Vries, and Turkenburg (2005) the theoretical
potential of bioenergy at the total terrestrial surface is about 3,500EJ/year. The greater part of this
potential is located in South America and Caribbean (47–221 EJ/year), sub-Saharan Africa (31–
317EJ/year) and the Commonwealth of Independent States (C.I.S) and Baltic states (45–199EJ/
year). The yield of biomass and its potential varies from country to country, from medium yields in
temperature to high level in sub tropic and tropic countries. With biomass, a lot of research is focus-
ing on an environmentally acceptable and sustainable source to mitigate climate change (Demirbas,
Balat, & Balat, 2009).
3.2.2. Bioenergy environmental and social impact
The use of biological components (plant and animal source) to produce energy has always been a
cause of worry especially to the general public and as to whether its food produce are to be used to
provide fuel since there are cases of food aid needed around the world in deprived countries. About
99.7% of human food is obtained from the terrestrial environment, while about 0.3% comes from
the aquatic domain. Most of the suitable land for biomass production is already in use (Ajanovic,
2011). Current studies have underlined both positive and negative environmental and socio-eco-
nomic eects of bioenergy. Like orthodox agriculture and forestry systems, bioenergy can worsen
soil and vegetation degradation related with the overexploitation of forest, too exhaustive crop and
forest residue removal, and water overuse (Koh & Ghazoul, 2008; Robertson et al., 2008). Diversion

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of crops or land into bioenergy production can induce food commodity prices and food security
(Headey & Fan, 2008). Proper operational management, can bring about some positive eects which
includes enhanced biodiversity (Baum, Leinweber, Weih, Lamersdorf, & Dimitriou, 2009; Schulz,
Brauner, & Gruß, 2009), soil carbon increases and improved soil productivity (Baum, Weih, Busch,
Kroiher, & Bolte, 2009; Edenhofer et al., 2011; Tilman, Hill, & Lehman, 2006).
3.3. Direct solar energy
The word “direct” solar energy refers to the energy base for those renewable energy source tech-
nologies that draw on the Sun’s energy directly. Some renewable technologies, such as wind and
ocean thermal, use solar energy after it has been absorbed on the earth and converted to the other
forms. Solar energy technology is obtained from solar irradiance to generate electricity using photo-
voltaic (PV) (Asumadu-Sarkodie & Owusu, 2016d) and concentrating solar power (CSP), to produce
thermal energy, to meet direct lighting needs and, potentially, to produce fuels that might be used
for transport and other purposes (Edenhofer et al., 2011). According to the World Energy Council
(2013), “the total energy from solar radiation falling on the earth was more than 7,500 times the
World’s total annual primary energy consumption of 450EJ” (Urban & Mitchell, 2011).
3.4. Geothermal energy
Geothermal energy is obtained naturally from the earth’s interior as heat energy source. The origin
of the heat is linked with the internal structure of the planet and the physical processes occurring
there. Although heat is present in the earth’s crust in huge quantities, not to mention the deepest
parts, it is unevenly distributed, rarely concentrated, and often at depths too great to be exploited
mechanically.
Geothermal gradient averages about 30°C/km. There are areas of the earth’s interior which are
accessible by drilling, and where the gradient is well above the average gradient (Barbier, 2002).
Heat is mined from geothermal reservoirs using wells and other means. Reservoirs that are naturally
adequately hot and permeable are called hydrothermal reservoirs, while reservoirs that are satisfac-
torily hot but are improved with hydraulic stimulation are called enhanced geothermal systems
(ESG). Once drawn to the surface, fluids of various temperatures can be used to generate electricity
and other purposes that require the use of heat energy (Edenhofer et al., 2011).
3.5. Wind energy
The emergence of wind as an important source of the World’s energy has taken a commanding lead
among renewable sources. Wind exists everywhere in the world, in some places with considerable en-
ergy density (Manwell, McGowan, & Rogers, 2010). Wind energy harnesses kinetic energy from moving
air. The primary application of the importance to climate change mitigation is to produce electricity
from large turbines located onshore (land) or oshore (in sea or fresh water) (Asumadu-Sarkodie &
Owusu, 2016e). Onshore wind energy technologies are already being manufactured and deployed on
large scale (Edenhofer et al., 2011). Wind turbines convert the energy of wind into electricity.
3.6. Ocean energy (tide and wave)
Surface waves are created when wind passes over water (Ocean). The faster the wind speed, the
longer the wind is sustained, the greater distance the wind travels, the greater the wave height, and
the greater the wave energy produced (Jacobson & Delucchi, 2011). The ocean stores enough en-
ergy to meet the total worldwide demand for power many times over in the form of waves, tide,
currents and heat. The year 2008 saw the beginning of the first generation of commercial Ocean
energy devices, with the first units being installed in the UK-SeaGen and Portugal-Pelamis. There are
presently four ways of obtaining energy from sea areas, namely from Wind, Tides, Waves and
Thermal dierences between deep and shallow Sea water (Esteban & Leary, 2012).
4. Renewable energy and sustainable development
Renewable energy has a direct relationship with sustainable development through its impact on human
development and economic productivity (Asumadu-Sarkodie & Owusu, 2016b). Renewable energy sources

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provide opportunities in energy security, social and economic development, energy access, climate change
mitigation and reduction of environmental and health impacts (Asumadu-Sarkodie & Owusu, 2016g).
Figure 1 shows the opportunities of renewable energy sources towards sustainable development.
4.1. Energy security
The notion of energy security is generally used, however there is no consensus on its precise inter-
pretation. Yet, the concern in energy security is based on the idea that there is a continuous supply
of energy which is critical for the running of an economy (Kruyt, van Vuuren, de Vries, & Groenenberg,
2009). Given the interdependence of economic growth and energy consumption, access to a stable
energy supply is of importance to the political world and a technical and monetary challenge for
both developed and developing countries, because prolonged interferences would generate serious
economic and basic functionality diculties for most societies (Edenhofer et al., 2011; Larsen et al.,
2009). Renewable energy sources are evenly distributed around the globe as compared to fossils
and in general less traded on the market. Renewable energy reduces energy imports and contribute
diversification of the portfolio of supply options and reduce an economy’s vulnerability to price vola-
tility and represent opportunities to enhance energy security across the globe. The introduction of
renewable energy can also make contribution to increasing the reliability of energy services, to be
specific in areas that often suer from insucient grid access. A diverse portfolio of energy sources
together with good management and system design can help to enhance security (Edenhofer et al.,
2011).
4.2. Social and economic development
Generally, the energy sector has been perceived as a key to economic development with a strong
correlation between economic growth and expansion of energy consumption. Globally, per capita
incomes are positively correlated with per capita energy use and economic growth can be identified
as the most essential factor behind increasing energy consumption in the last decades. It in turn
creates employment; renewable energy study in 2008, proved that employment from renewable
energy technologies was about 2.3 million jobs worldwide, which also has improved health, educa-
tion, gender equality and environmental safety (Edenhofer et al., 2011).
4.3. Energy access
The sustainable development goal seven (aordable and clean energy) seeks to ensure that energy
is clean, aordable, available and accessible to all and this can be achieved with renewable energy
Figure 1. Opportunities of
renewable energy sources.
Renewable Energy
Energy Security
Energy Access
Climate Change
Mitigation and
Reduction of
Environmental and
Health Impacts
Social and Economic
Development

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source since they are generally distributed across the globe. Access concerns need to be understood
in a local context and in most countries there is an obvious dierence between electrification in the
urban and rural areas, this is especially true in sub-Saharan Africa and South Asian region (Brew-
Hammond, 2010).
Distributed grids based on the renewable energy are generally more competitive in rural areas
with significant distances to the national grid and the low levels of rural electrification oer substan-
tial openings for renewable energy-based mini-grid systems to provide them with electricity access
(Edenhofer et al., 2011).
4.4. Climate change mitigation and reduction of environmental and health impacts
Renewable energy sources used in energy generation helps to reduce greenhouse gases which miti-
gates climate change, reduce environmental and health complications associated with pollutants
from fossil fuel sources of energy. The change in total GHG emissions in European Environmental
Agency (EEA) countries for 1990–2012 and their GHG emissions per capita are depicted in Figures 2
and 3. Figure 2 shows that greenhouse gas emissions declined by 14% in 33 EEA countries between
the years 1990–2012. Nevertheless, there was variation in individual member countries, while there
was a decrease in GHG emissions in 22 EEA countries, there was an increase in 11 EEA countries. GHG
emissions per capita declined by 22% between the years 1990–2012 in the EEA countries as de-
picted in Figure 3 (EEA, 2016).
Figure 4 shows United States carbon dioxide gas emissions from 1990–2013. Figure 2 shows an
example of carbon dioxide emission levels being reduced from 1990–2013 in United States, a shift
from mainly fossil fuel-based energy sources to renewable energy sources (United States
Environmental Protection Agency, 2014).
5. Challenges aecting renewable energy sources
Renewable energy sources could become the major energy supply option in low-carbon energy
economies. Disruptive alterations in all energy systems are necessary for tapping widely available
renewable Energy sources. Organizing the energy transition from non-sustainable to renewable en-
ergy is often described as the major challenge of the first half of the twenty-first century (Verbruggen
et al., 2010). Figure 5 shows the interconnection of factors aecting renewable energy supplies and
sustainability. It is evident from Figure 5 that a major barrier towards the use of renewable energy
source depends on a country’s policy and policy instrument which in turn aect the cost and tech-
nological innovations. In addition, technological innovations aect the cost of renewable energy
Figure 2. Change in total GHG
emissions in EEA-33 countries
(1990–2012) (EEA, 2016).

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technologies which in turn leads to market failures and low patronization of the renewable energy
technology. In the light of this, an eective renewable energy policy should take the interconnection
of factors aecting renewable energy supplies and sustainability into consideration.
The following are policy recommendations emanating from the study that can help mitigate cli-
mate change and its impacts:
• All sectors and regions have the potential to contribute by investing in Renewable energy tech-
nologies and policies to help reduce it.
• Reducing our carbon footprint through the changes in lifestyle and behaviour patterns can con-
tribute a great deal to the mitigation of climate change.
• Research into innovations and technologies that can reduce land use and also reduce accidents
from renewable energy sources and the risk of resource competition, for example in Bioenergy
where food for consumption competing with energy production.
• Enhancing international cooperation and support for developing countries towards the expan-
sion of infrastructure and upgrading technology for modern supply and sustainable energy ser-
vices as a way of mitigating climate change and its impacts.
Figure 4. United States
carbon dioxide gas emissions,
1990–2013 (United States
Environmental Protection
Agency, 2014).
Figure 3. GHG emissions per
capita in EEA-33 countries
(EEA, 2016).

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6. Conclusion
Energy is a requirement in our everyday life as a way of improving human development leading to
economic growth and productivity. The return-to-renewables will help mitigate climate change is an
excellent way but needs to be sustainable in order to ensure a sustainable future for generations to
meet their energy needs. Knowledge regarding the interrelations between sustainable development
and renewable energy in particular is still limited. The aim of the paper was to ascertain if renewable
energy sources were sustainable and how a shift from fossil fuel-based energy sources to renewable
energy sources would help reduce climate change and its impact. A qualitative research was em-
ployed by reviewing papers in the scope of the study. Even though, the complete lifecycle of renew-
able energy sources have no net emissions which will help limit future global greenhouse gas
emissions. Nevertheless, the cost, price, political environment and market conditions have become
barriers preventing developing, least developed and developed countries to fully utilize its poten-
tials. In this way, a creation of global opportunity through international cooperation that supports
least developed and developing countries towards the accessibility of renewable energy, energy ef-
ficiency, clean energy technology and research and energy infrastructure investment will reduce the
cost of renewable energy, eliminate barriers to energy eciency (high discount rate) and promote
new potentials towards climate change mitigation.
The study brought to light the opportunities associated with renewable energy sources; energy
security, energy access, social and economic development and climate change mitigation and re-
duction of environmental and health impacts. There are challenges that tend to hinder the sustain-
ability of renewable energy sources and its ability to mitigate climate change. These challenges are:
market failures, lack of information, access to raw materials for future renewable resource deploy-
ment, and most importantly our (humans) way of utilizing energy in an inecient way.
From the findings, the following suggestions are made that can help improve the concerns of re-
newable energy being sustainable and also reduce the rate of the depletion of the ozone layer due
to the emissions of GHG especially carbon dioxide (CO2):
Figure 5. Interconnection
of factors aecting
renewable energy supplies
and sustainability, adapted
from Edenhofer et al. (2011);
Verbruggen et al. (2010).
{Potentials of } Rene wable energy supplies (sources technologies) and
sust ainability
Barriers( Market failures , lack of information,
future limited access to raw materials and
Ec onomic)
Man-made and changeable
Technological innovation
Cost Prices
Polices and Po licy Instruments

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• Formulation of policies and discussions from all sectors towards the improvement of technolo-
gies in the renewable sector to sustain them.
• Changes in our use of energy in a more ecient way as individuals, countries and the world as a
whole. Eorts that aim at increasing the share of renewable energy and clean fossil fuel tech-
nologies into global energy portfolio will help reduce climate change and its impacts. Energy
eciency programmes should be introduced globally, which give tax exemptions to firms who
prove to provide energy eciency initiatives (energy-ecient homes), product design (energy-
ecient equipment) and services (industrial combined heat and power). Introducing the con-
cept of usability, adaptability and accessibility into energy-dependent product design is a way of
promoting energy ecient behaviours.
• Increase research in these areas, so that the fear of some renewables posing risks in the future
is limited.
• Improve education, awareness-raising and human institutional capacity on climate change
mitigation, adaptation, impact reduction and early warning. Developed countries should incor-
porate decarbonization policies and strategies into the industry, energy, agricultural, forest,
health, transport, water resource, building and other sectors that have potential of increasing
greenhouse gas emissions. Eorts in developing countries aimed at improving institutional
training, strengthening institutions and improving capacity of research on climate change will
increase awareness, promote adaptation and sustainable development. Least developed coun-
tries should develop and test tools and methods with a global support that direct policy and
decision-making for climate change mitigation, adaptation and early warnings. Supporting a
global dialogue through international cooperation and partnership with developed, developing
and least developed countries will promote the development, dissemination and transfer of en-
vironmentally friendly technologies, innovation and technology, access to science, and among
others which will increase the mutual agreement towards combating climate change and its
impacts.
If these suggestions are implemented, the sustainability of renewable energy resources would be
addressed as well as the seventh and thirteenth goal of sustainable development which seeks to
ensure access to aordable, reliable, sustainable, modern energy for all and combat climate change
and its impact.
Funding
The authors received no direct funding for this research.
Author details
Phebe Asantewaa Owusu
1
E-mail: phebe.owusu@metu.edu.tr
Samuel Asumadu-Sarkodie
1
E-mail: samuel.sarkodie@metu.edu.tr
1
Sustainable Environment and Energy System, Middle East
Technical University, Northern Cyprus Campus, Kalkanli,
Guzelyurt 99738, TRNC, Turkey.
Citation information
Cite this article as: A review of renewable energy sources,
sustainability issues and climate change mitigation, Phebe
Asantewaa Owusu & Samuel Asumadu-Sarkodie, Cogent
Engineering(2016), 3: 1167990.
Cover image
Source: Authors.
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