Forthcoming articles


International Journal of Environment and Sustainable Development


These articles have been peer-reviewed and accepted for publication in IJESD, but are pending final changes, are not yet published and may not appear here in their final order of publication until they are assigned to issues. Therefore, the content conforms to our standards but the presentation (e.g. typesetting and proof-reading) is not necessarily up to the Inderscience standard. Additionally, titles, authors, abstracts and keywords may change before publication. Articles will not be published until the final proofs are validated by their authors.


Forthcoming articles must be purchased for the purposes of research, teaching and private study only. These articles can be cited using the expression "in press". For example: Smith, J. (in press). Article Title. Journal Title.


Articles marked with this shopping trolley icon are available for purchase - click on the icon to send an email request to purchase.


Articles marked with this Open Access icon are freely available and openly accessible to all without any restriction except the ones stated in their respective CC licenses.


Register for our alerting service, which notifies you by email when new issues of IJESD are published online.


We also offer RSS feeds which provide timely updates of tables of contents, newly published articles and calls for papers.


International Journal of Environment and Sustainable Development (20 papers in press)


Regular Issues


  • Mechanical characterization and flexural performance of eco-friendly concrete produced with fly ash as cement replacement and coconut shell coarse aggregate   Order a copy of this article
    by Prakash R, Thenmozhi R, S.N. Raman 
    Abstract: The aim of this study is to investigate the effect of adding fly ash, an industrial by-product and coconut shell, an agricultural waste on the mechanical and flexural characteristics of eco-concrete. The study focusses on density, compressive strength, tensile strength and flexural behavior of the coconut shell eco-concrete. Two different mixes are developed, one with coconut shell and the other with conventional aggregate and coconut shell as coarse aggregate. The cement content is replaced with Class F Fly ash at 0%, 10%, 20% and 30% by weight. The test result shows that the coconut shell concrete produced with 10% fly ash has recorded higher compressive, tensile strength than other proportions. Fly ash inclusion further reduces the density of coconut shell concrete. The higher deflection of coconut shell concrete before failure shows that it has failed in a ductile manner. The flexural behavior is comparable with other lightweight concretes. It is suggested that an eco-friendly, cost effective structural lightweight concrete can be produced by using coconut shell and fly ash.
    Keywords: Coconut shell aggregate; Fly ash; Eco-concrete; Compressive strength; Split tensile strength; Flexural behavior.

  • An assessment of road construction in Walmer Township, Nelson Mandela Bay Municipality, South Africa   Order a copy of this article
    by Pakama Siyongwana, Manesh Nagar 
    Abstract: The provision of a sustainable road infrastructure has become a top priority for the South African government since the attainment of democracy in 1994. This paper reports on a study carried out in Nelson Mandela Bay Metropolitan Municipality, South Africa, aimed at assessing the provision of the road infrastructure and the financial sustainability of road infrastructure development from 2004-2011 in the Walmer Township. The methodology used in the study was a simple method of overlaying the ordinance survey onto high resolution aerial photographs using Walmer Township as the basic unit of observation and thereafter, extract and digitise the necessary information for the selected years. Fieldwork observations and interviews with relevant stakeholders were conducted to qualify the resultant pattern or to fill missing gaps. The resulting information was translated into thematic, qualitative and quantitative data. Analysis involved the generation of descriptive statistics and applicable tables; and the research was aimed at: 1) reviewing the state of road construction costs in the NMBM, 2) providing a comparative analysis of the road provision, 3) an assessment of the financial feasibility of the road infrastructure in the Walmer Township. The results showed the variation in the construction costs across time indicating spatial variation in road infrastructure developmental initiatives, discrepancies in budget allocation that favour certain areas, and a discord in the coordination of budget and planning. The studys significance lies in its highlighting of the need to review and redesign the planning of municipal infrastructure projects if they are to attain financial sustainability.
    Keywords: Road infrastructure delivery; financial sustainability; Walmer Township; Nelson Mandela Bay.

    by Sunday Olayinka Oyedepo, Isreal S. Dunmade, Tunde Adekeye, Ahme, B. Attabo, Olukunle C. Olawole, Philip O. Babalola, Joseph A. Oyebanji, Mfon Udo, Oluwaseun Kilanko, Richard O. Leramo 
    Abstract: In Nigeria, high and outrageous energy cost constitutes a serious challenge to all aspects of the economy. And this has been a subject of concern in the country over a period of time. A dependable and renewable energy source is of utmost desire to strengthen the nations economy and this urgent need cannot be overlooked. As a result of the erratic and expensive power supply to the national grid, it has become ultimately necessary to search for other inexpensive sources of energy to meet the ever increasing energy needs for rural and urban dwellers. This will in no small way improve the countrys national grid and consequently decrease rural-urban movement. The heavy reliance on natural gas to power electric power generation plants makes the country to be prone to power outages due to gas pipelines destruction resulting to in-sufficient gas supply by Nigerian Gas Company to most thermal power plants. In view of the above energy situation in Nigeria, this paper aimed at carrying out a comprehensive review on bioenergy technology option as a pathway to achieving sustainable energy development in the country. In this study, the potential, current progressive stages, and prospects of bioenergy conversion techniques, in the Nigeria context, are discussed. The barriers to bioenergy technology development in Nigeria with possible solutions are also presented. The study reveals that available information for the studied renewable energy option suggests bioenergy possess some potentials for the countrys sustainable energy development. Using biomass technology to generate power can help the country develop its energy sector more efficiently as the raw materials needed to feed the bioenergy plants are readily available in abundance in the country. Some are seen as waste such as agricultural and domestic wastes. Hence, developing the bioenergy capacity of the country will create wealth and employment opportunities for the unemployed sector in the country, generates electricity and production of domestic cooking gas across the rural and urban settlements in the country.
    Keywords: Bioenergy technology; renewable energy; energy sector; sustainable development; biomass; agricultural wastes; municipal wastes; industrial wastes.

  • Exploring the link between climate variability and mortality in sub-Saharan Africa   Order a copy of this article
    by Baishali Bakshi, Raphael Nawrotzki, Joshua Donato, Luisa Silva Lelis 
    Abstract: High mortality rates in sub-Saharan Africa persist, delaying the achievement of the Sustainable Development Goals. In this study, we investigated whether climate variability contributed to elevated mortality rates in rural Kenya, Mali, and Malawi during 2008/09. We employed a demographic approach, linking high-resolution climate information to nationally representative census data obtained from the Terra Populus data extraction system. We employed multilevel negative binomial models to estimate the association between household-level all-cause mortality and climate variability from a long-term climate normal period (1961-1990). Results revealed that cold snaps increased mortality in Kenya but reduced mortality in Mali and Malawi. In addition, excessive precipitation and droughts were associated with increased mortality rates in Kenya and Malawi, respectively. Interaction models showed the strongest climate effects on mortality in vulnerable regions characterized by high HIV/AIDS prevalence rates. In contrast, adverse climatic conditions were associated with lower mortality in areas with high rates of malaria infection, likely due to unfavorable breeding conditions for the Anopheles vector. Programs aimed at reducing climate-related mortality through early warning systems, agricultural extension services, and improved access to health infrastructure will help to more fully realize the Sustainable Development Goals of a reduction in mortality for sub-Saharan Africa.
    Keywords: Climate variability; environment; mortality; sub-Saharan Africa; Terra Populus.

  • Governing climate change: The impact of board attributes on climate change disclosure   Order a copy of this article
    by Say Keat Ooi, Azlan Amran, Jasmine A.L. Yeap, Amar Hisham Jaaffar 
    Abstract: With its detrimental impacts, climate change is one of the most pressing challenges of human civilisation. To hold businesses accountable for climate change performance, corporate climate change disclosure has increased substantially over the last decade. Despite the importance of corporate governance, its impact on climate change disclosure remains under researched. Hence, this paper examines the impact of board attributes on climate change disclosure and attempts to explore the mediation effect of strategic corporate social responsibility (CSR) on such relationships. The results reveal that the extent of climate change disclosure increases with the presence of more female and independent directors. Enhanced insights into strategic CSR are expected to be valuable for board members seeking to internalise CSR strategically despite the insignificant indirect effect. Overall, these findings embrace worldwide initiatives to promote independence and gender diversity in the boardroom while demonstrating corporate transparency in climate change business impacts.
    Keywords: climate change disclosure; corporate governance; board attributes; strategic corporate social responsibility (CSR); resource dependence theory; Malaysia.

  • Comparative analysis of lists of ecosystem services classified by function   Order a copy of this article
    by Aicha Bouredji 
    Abstract: Functional classification of ecosystem services is a very popular method, originated in the international Millennium Ecosystem Assessment report. Other organizations have adopted this approach and have developed it by deploying it in their sustainable development strategies. These alternations prompted demands for appropriate public policies. Thus, the problem of environmental quantification appeared because it requires finely cohesive tools. To examine the compatibility of all the lists of ecosystem services, this paper proposes an inspection of the classifications proposed by eight global organizations and a comparative analysis of their rankings. This makes it possible to check whether it would be relevant to rely on these classifications for quantification. Through a thorough examination method, the compositions will be processed and enhanced. The results of this work will provide a theoretical framework as a tool to help environmental assessment. It will bring together a fixed set of services that helps implement a concrete application.
    Keywords: ecosystem services; ecosystem; assessment; quantification; classification; functional approach; methodological framework; conservation; provisioning services; supporting services; regulating services; cultural services; sustainable development; ecological economics.

  • Energy Consumption, CO2 Emission and Economic Growth: Empirical Evidence for Malaysia   Order a copy of this article
    by Md. Sujahangir Kabir Sarkar, Abul Quasem Al-Amin, Siti Indati Mustapa, Md. Rajibul Ahsan 
    Abstract: This study focuses on the relationship among the energy consumption, carbon emission and economic growth of Malaysia by using a time series data from 1980-2016. The study findings are shown by an econometric analysis that energy consumption, total and per capita CO2 emission and GDP (gross domestic product) has increased vastly between 1980 and 2016. The Johansen cointegration test confirms the existence of the long run relationship of energy consumption with carbon emission and economic growth. Moreover, the Granger causality test reveals the unidirectional causality of energy demand and population with carbon emission. The positive and significant relationship between GDP and carbon emission is a critical issue in Malaysia that needs to be addressed with care as economic growth is necessary but increase of carbon emission is undesirable. Therefore, this study recommends to promote green energy, green growth (GDP) that will ensure both energy security and energy sustainability in Malaysia over time.
    Keywords: Energy consumption; carbon emission; economic growth; green energy; policy; Malaysia.

  • Lightweight and prefabricated construction as a path to energy efficient buildings: thermal design and execution challenges   Order a copy of this article
    by Eduardo Roque, Rui Oliveira, Ricardo Almeida, Romeu Vicente, António Figueiredo 
    Abstract: Energy efficient buildings start with a building design stage based on a strong background in building physics and construction technology. Traditionally, in southern European countries, massive construction solutions have always been associated with better thermal performance and more suited to easily comply with different performance and construction code criteria. However, lightweight construction systems have the potential to achieve clear benefits over traditional heavyweight construction. The market share of lightweight construction systems, from steel to timber, has grown significantly in the last two decades in countries that traditionally do not have strong background and workmanship on this construction type. Thus, two case studies were detailed presented, combining lightweight construction systems and Passive House concept, with the goals of energy efficiency and thermal comfort. The results highlight the advantages of these systems both from an economical (cost-efficiency and speed of construction) and environmental point of view (recycling, waste production and reuse). Some drawbacks of lightweight building solutions have been pointed out, from low thermal inertia, overheating, airtightness, thermal bridging (building connections and assembly), higher susceptibility to moisture transfer, shading control, etc. Due to the possible low thermal inertia of this constructive technology, a new wall solution incorporating phase change materials was tested and thermally characterised. This solution could be applied in lightweight constructions, enhancing their energy efficiency and thermal inertia, further promoting the sustainability of these building solutions. In fact, all these issues have been overcome and are highly addressable in the design stage and considered in the latest developments on lightweight construction building systems.
    Keywords: Lightweight construction; Energy efficiency; Light steel frame; Passive House; Innovative materials and components; Phase change materials.

Special Issue on: ICESW2017 Applied Engineering Science, Environment & Sustainability

    by Akpabot Akpabot, Anthony Ede, Oluwarotimi Olofinnade, Gideon Bamigboye 
    Abstract: Buildings are designed to be safe to prevent collapse caused by natural or man-made factors. Until recently, Nigeria was believed to be aseismic due to its distance from earthquake zones. However, recent seismic activities have led to the prediction of possible future earthquake occurrence in Nigeria. This study estimate the impact of seismic hazard on the built environment in Nigeria. A model is created to estimates the number of casualties and built areas that would be affected by earthquake of different ground motions. Monte Carlo simulation is used to derive random data of building area, occupancy limits, construction quality and failure probability for the computational analysis. The results showed that an average seismic intensity measure will affect between 1000 1060 km2 of building area and about 6.5 6.9 million people will be affected. Consequently, these huge losses requires urgent mitigating efforts to reduce risks of damages when earthquake occur.
    Keywords: Reinforced-concrete; Building collapse; Seismic-risks; Built area; Ground motion; Construction quality; Built environment; Seismic intensity; Monte Carlo simulation; Sustainability.

Special Issue on: ICEBSS 2017 People, Planet and Development Bridging the Gaps in Emerging Economies

  • Climate change adaptation: a corrective policy framework in the Malaysian agricultural sector   Order a copy of this article
    by Rulia Akhtar, Muhammad Mehedi Masud, Abu Hanifa Md. Noman, Najneen Jabin, A. S. A. Ferdous Alam 
    Abstract: A corrective policy framework is essential for sustainable agricultural management. In order to put in place a corrective policy framework, it is necessary to know the socio-economic context of local farmers and their perception of climate change. Therefore, the main objective of this study is to explore their socio-economic status and general perception of climate change and to examine its impact on adaptation practices. To achieve the research objectives, data were collected using survey questionnaires and analyzed using statistical tools. The results show that most of the respondents between age range of 31-45 years in the sample size while 45 percent ha secondary education and 34 percent of the respondents monthly income between RM 2000- RM 4000. It has been found that approximately 76 per cent of farmers had heard about climate change. The results also revealed that socio-economic characteristics such as education, income, type of farmer, attitudes and awareness were positive and highly significant. It is hoped that the findings of this study would be useful for policymakers in designing an appropriate policy framework to raise awareness of how to reduce the impact of climate change in the agricultural sector.
    Keywords: Climate Change; Agriculture; Farmers’ perceptions; Attitudes; Policy framework.

    by Md Wahid Murad, Md. Mahmudul Alam 
    Abstract: The poverty-environment nexus is still being debated since it came into light in the late 1980s. The extent of poverty and nature of environmental degradation make the debate further complex as researchers present their research outcomes, whether conceptual or empirical, based only on limited data and a number of assumptions. This study is such an attempt looking at the poverty-environment paradox from the perspective of an emerging country, i.e. Malaysia. Household solid wastes, if recycled, reused and source-reduced, are widely considered environmental resources as these practices are meant to protect the environment and increase peoples incomes or save costs especially for societys poorer people. To test the hypothesis that poverty is the root cause of environmental degradation or environmental degradation is the effect of poverty, this study assesses attitude and behavior of the urban poor with reference to solid waste management and their willingness to pay for an improved solid waste collection and disposal service in their residential areas. Primary data collected through a survey with urban poor residing in Kuala Lumpur and analytical methods including descriptive statistical technique, t-test of equality of means, one-way analysis-of-variance, Chi-square likelihood ratio test and multiple linear regression have been used to test the hypothesis and accomplish the objective. Empirical results nullify the null hypothesis, favoring the urban poor as their attitude and behavior are found to be environmentally sound and surprisingly ethical. Also, their monetary contribution, as measured through willingness to pay, for the objective of improving environmental conditions is considered to be good news for local governments, who could use this strategy in their efforts to improve the environment and reduce urban poverty. Policies and initiatives such as pro-poor waste management, community participation in waste management, integrating the informal sector into formal waste management avenues, public-private partnership in waste management, and raising awareness among the relevant stakeholders are considered crucial for reducing both the environmental degradation and urban poverty.
    Keywords: poverty-environment paradox; waste management; urban poor; willingness to pay; environmental attitude and behavior; Malaysia.

  • Sustainability of Malaysian Oil Palm: A Critical Review   Order a copy of this article
    by Halima Begum, A. S. A. Ferdous Alam, Abd. Hair Awang 
    Abstract: Despite some industrial disruption, palm oil is still among the strongest industry of Malaysia. This journey of excellence towards becoming the global leader is getting momentum by support from MPOB, a leader in palm oil research across the globe. This study is to assess the oil palm smallholder activities in Malaysia in order to ensure the sustainability to face the global challenges and competitions of the international markets. Thus, the industry is emerging not only as a dependable source of economic empowerment of the country, but also posing a serious threat towards ecological and social balance due to unawareness of the sustainability issues. With their outstanding share, the industry has potential to lead the market in the near future, but in the way of expansion it must focus on the sustainability issues especially related to environment, economy and society, which can adversely or constructively influence the industry and its production.
    Keywords: environmental; economic; social; sustainability; oil palm; palm oil industry; fresh fruit bunch; smallholders; sustainable practices; Malaysia.
    DOI: 10.1504/IJESD.2020.10020711

Special Issue on: SEDD 2018 Energy, Environment and Sustainability

  • Quantitative Analysis of Sound Absorption Properties of Plants in Indoor Environment for Enabling Sustainable Practices   Order a copy of this article
    by Namrata Baruah, Satyaki Sarkar, Bimal Chandra Roy, Rajan Chandra Sinha 
    Abstract: This paper showcases the results of the sound attenuation properties of some plants with a soil substrate for use as green sound absorbers in an indoor space. The plants used in this experiment were needed to survive in an indoor environment, hence only tropical, thermophilic plants which could grow in high humidity and warm temperatures with indirect sunlight were selected. An Impedance tube of 100mm dia. was used to calculate the direct incidence acoustic absorption coefficient of the plants and larger samples were tested within a reverberation chamber. The soil substrate used was a high porosity and low-density sample of perlite and coconut fibers. The results show that Ferns and Baby Tears were good absorbers along with the soil substrate, whereas Begonia was a better absorber at the lower and higher frequencies. The decibel drop by the fern with soil substrate is the highest with a decrease of frequency and the lowest is by Green Ivy which is due to morphological conditions.
    Keywords: sound absorption; indoor space; experiment; Impedance tube; reverberation chamber; soil substrate; thermophilic plants; sound-absorption coefficient; decibel drop; sustainable plant usage.

  • Strategically-framed environmental disclosure index: A Measurement Approach of Malaysian Public Listed Companies Corporate Environmental Reporting Practices.   Order a copy of this article
    by Amar Hisham Jaaffar, Bakhtiar Alrazi, Say Keat Ooi, Amanuddin Shamsuddin 
    Abstract: This study aims to measure the corporate environmental reporting (CER) practices of Malaysian environmentally sensitive public listed companies based on measurement approach named strategically-framed environmental disclosure index. The content analysis technique based on a measurement index related to firms environmental strategies has been employed. The CER practices of 209 Malaysian environmentally sensitive public listed companies are examined for the years 2010 and 2014. Results suggest that there are three types of firm behaviour in CER in response to institutional pressures: (1) 'negative deviance' (i.e. non-compliance environmental strategies leading to no quality environmental disclosures), (2) 'conformance (i.e. compliance environmental strategies leading to low quality environmental disclosures) and (3) 'positive deviance' (beyond-compliance or proactive environmental strategies leading to high quality environmental disclosures). This index shed light whether the Environmental Social Governance (ESG) practice in Malaysian and global context as a deviance or normative behaviour. Moreover this study identified whether mandatory reporting requirement force firm to actually improve environmental performance concurrently with pro-environmental policies or just as their greenwashing mechanism.
    Keywords: Corporate Environmental Reporting; Strategically-framed environmental disclosure index; Neo-Institutional Theory; Positive Organizational Scholarship; Environmental; Social and Governance (ESG).

  • Evaluating the Impact of Implementing Minimum Energy Performance Standards (MEPS) Appliance Regulation in Malaysia   Order a copy of this article
    by Siti Fatihah Salleh, Mohd Eqwan Mohd Roslan, Aishah Mohd Isa 
    Abstract: One of Malaysias key strategies to promote efficient use of energy is by implementing the Minimum Energy Performance Standards (MEPS). Under this regulation, five common household appliances (air conditioner, refrigerator, fan, television, and lamp) must comply with MEPS requirement in order to be sold in Malaysian market. This study collected sales data from major suppliers to estimate the annual sales volume of MEPS-compliant appliances from 2013 to 2015. The sales estimates were used to determine the total electricity consumption and saving during the same time period. The study found that the local market is already saturated with 5-star rated televisions and fans in 2015. Meanwhile, the lamp market proportion is dominated by compact fluorescent lamps (CFL) with efficacy range from 50 to 55 lumens/watt. By the end of 2015, the total cumulative annual electricity saving gained after MEPS implementation is 2,685 GWh, which translates to a total annual cost saving of MYR 850 million and fossil carbon emission reduction of 1,726 ktCO2eq. By identifying and quantifying the multiple impacts of MEPS implementation in Malaysia, this work not only demonstrates the effectiveness of the current initiative, but also motivates higher uptake of energy efficiency interventions in developing countries to unlock more opportunity in the future.
    Keywords: energy efficiency; minimum energy performance standards (MEPS); Malaysia; standards and labelling (S&L); household appliance; energy saving.

    by SITI INDATI MUSTAPA, Siti Fatihah Salleh 
    Abstract: The rapid development of the transport sector has caused tremendous pressures on energy consumption and CO2 emission. Energy use for the road transport sector is growing faster, but the scope for substituting towards low carbon fuels is rather limited. As the increase in CO2 emissions has become an important global issue, many countries have put up a voluntary target of reducing its CO2 emissions. Similarly, Malaysia has set a target to reduce the intensity by up to 45% by 2030 based on its 2005 levels. This has led to strong interest in how the CO2 emissions in this sector can optimally reduce. This paper therefore looks at minimising the CO2 emissions from the transportation sector. A linear programming model is applied to model the present situation in Malaysia. Sensitivity analysis is applied to investigate the effects of mitigation scenarios such as low carbon fuels, fuel efficiency improvement, travel demand management, and integrated mitigation strategies on the CO2 emissions. The results demonstrated that the optimal CO2 emissions in the road transport sector could reduce by only 2.8% (1.14 Mtons) in a year, which far below the desired emissions reduction. However, the sensitivity analysis results demonstrated that a reduction of up to 40% (16.44 Mtons) can be achieved from integrated mitigation measures, which enable Malaysia to hit reduction far beyond its target. The outcome of this study proved that intensifying ongoing efforts and stringent policies to promote efficient fuel use and investment in green technology could assist the country in its quest to achieve the intended CO2 emissions reduction.
    Keywords: road transport sector; CO2 emissions; optimisation; low carbon.

  • Analysis of Urban Water Quality Trends for Effective Reservoir Sedimentation Management in Cameron Highland   Order a copy of this article
    by NURSHAHIRA MOHAMMAD NOH, Lariyah Mohd Sidek, Siti Humaira Haron, Amirah Hanim Mohd Puad, Zalilah Selamat, Azwin Zailti Abdul Razad, Chow Ming Fai 
    Abstract: Water quality in Cameron Highlands has significantly diminished due to agricultural activities. This research aims to analyze water quality in the urban and agricultural area by conducting water sampling and in situ analysis. Water Quality Index (WQI), Total Nitrogen (TN) and Total Phosphorus (TP) were calculated and compared among different areas. Results for WQI shows that water quality at W7 deteriorates at class IV (33.5) compared to class II for another agriculture area. Meanwhile, another results showed that the WQ_02_AG transported significantly higher (14.9 mg/L) loads of TN than the urban area, but the phosphorus load was considerably lower (1.58 mg/L). Results for the urban area are slightly polluted and unsuitable for recreational purpose. In agricultural areas, water quality deteriorates due to sediment transport and nutrient infusion caused by agricultural activities. Therefore, powerful agricultural management practices for effective reservoir sedimentation management as one of the non-structural measures are recommended.
    Keywords: Water pollution; Water Quality Index; Agriculture; Sedimentation; Reservoir.

Special Issue on: ICEBSS 2017 Climate Change, Conflicts and Food Security in Developing Economies

  • The Impact of Spatial Development on Water Pollution: A Comparative Assessment of River Water Quality in Two Municipalities in Malaysia   Order a copy of this article
    by Hamidi Ismail, Tuan Pah Rokiah Syed Hussain, Muhammad Subhan 
    Abstract: This study is aimed at understanding different level of pollution of the river water in two municipalities in Malaysia as a result of spatial development activities. Both municipalities represent the central and southern zones of Peninsular Malaysia which are prone to river water quality problems due to logging, land clearing and livestock farming. Frequency and trend analysis are applied to the data obtained from the Department of Environment (DOE) and measurement of the water quality in the field is conducted in both areas. The results show that the rivers in both municipalities are experiencing deterioration of water quality. The decline in the river water quality is closely related to human activities in urban space and the ineffective environmental management system by the government. The apparent environmental problems indicate that the present management system should be improved to create an urban ecosystem which is really capable of addressing the issues of river water pollution.
    Keywords: Spatial development; River management; Urban management; Water pollution; Water quality; Sustainable development; Malaysia.

Special Issue on: Recent Developments in Environmental Sustainability

  • Population ageing and energy consumption for sustainable development   Order a copy of this article
    by Nur A'mirah Mohd Yaziz, Azlina Abd.Aziz 
    Abstract: Population ageing has been acknowledged as a cause of the alteration in residential energy consumption pattern, which partly arises from the exit of the workforce from the labour market due to the retirement age limit, promoting a sedentary lifestyle. However, there is a lack of research exploring the shift in energy demand that specifically scrutinises the effect of population ageing on the consumption structure. In this context, the paper aims to investigate the relationship between residential electricity consumption and demographic indicators specific to labour force participation. This study uses a literature survey of household consumption structure, ageing labour force participation, and energy consumption factors, while the econometric approach is proposed to estimate the determinants. Based on the findings, this study supports the inclusion of the employment rate in expressing residential electricity consumption in the population ageing scenario. This paper ends with the development of a proposed model for future research work due to the economics of population ageing in energy.
    Keywords: older people; household consumption; labour force participation; energy consumption factors; sustainability.

Special Issue on: Renewable Energy for Sustainable Applications

  • A Sustainable Energy Management Soft Computing System for Photovoltaic/Wind Hybrid Power Generation System   Order a copy of this article
    by SELVAM RAMAKRISHNAN, Velavan R, Soundarrajan A 
    Abstract: Recently, renewable energy sources turned all attentions and became more attractive, due to increasing energy needs and factors like limited reserves, increasing energy costs and environmental pollution. As these sources dont cause any environmental pollution and have an unlimited supply, it is extensively utilized every day. Solar and wind are the two renewable sources considered in this paper. In renewable energy system, for maintaining the energy sustainability, a smart management scheme is required. The renewable sources like solar/wind is established to test the management system. The development of smart management scheme fulfills the power demand, since solar and wind are not reliable in stipulations of power quality and sustainability. In the renewable energy system, the generated power is collected on a common DC bus which is used for supplying to load. This DC power bus is operated in an exceedingly manner that, there is forever a base power available for permanent loads. Then, depending upon the availability of those power sources, the extra power demand is provided from either PV or wind source. The whole system is operated by a smart management system with the help of the fuzzy logic method. The fuzzy based smart management system determines the amount of power to be supplied based on the power information from a solar / wind system. The smart power management system will measure and track the available and generated maximum power from wind system, which increases the installed units efficiency. The result obtained will prove the effectiveness of the smart power management system.
    Keywords: Wind System; PV system; Power management system; MPPT; Sustainability.
    DOI: 10.1504/IJESD.2019.10018356