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Sustainable construction aims to reduce the negative health and environmental impacts caused by the construction process and by the operation and use of buildings and the built environment. [1] It can be seen as the construction industry's contribution to more sustainable development. Precise definitions vary from place to place, and are constantly evolving to encompass varying approaches and priorities. More comprehensively, sustainability can be considered from three dimension of planet, people and profit across the entire construction supply chain. [2] Key concepts include the protection of the natural environment, choice of non-toxic materials, reduction and reuse of resources, waste minimization, and the use of life-cycle cost analysis.
One definition of "Sustainable Construction" is the introduction of healthy living and workplace environments, the use of materials that are sustainable, durable and by extension environmentally friendly.[ citation needed ] In the United States, the Environmental Protection Agency (EPA) defines sustainable construction as "the practice of creating structures and using processes that are environmentally responsible and resource-efficient throughout a building's life-cycle from siting to design, construction, operation, maintenance, renovation and deconstruction." [3] Agyekum-Mensah et al. note that some definitions of sustainable construction and development "seem to be vague" and they question use of any definition of "sustainability" which suggests that sustainable or acceptable activities can be continued indefinitely, because construction projects do not run on indefinitely. [4]
In the 1970s, awareness of sustainability emerged, [5] amidst oil crises. At that time, people began to realize the necessity and urgency of energy conservation, which is to utilize energy in an efficient way and find alternatives to contemporary sources of energy. Additionally, shortages of other natural resources at that time, such as water, also raised public attention to the importance of sustainability and conservation. [5] In the late 1960s, the construction industry began to explore ecological approaches to construction, aiming to seek harmony with nature. [6]
The concept of sustainable construction was born out of sustainable development discourse. [7] The term sustainable development was first coined in the Brundtland report of 1987, defined as the ability to meet the needs of all people in the present without compromising the ability of future generations to meet their own. [7] This report defined a turning point in sustainability discourse since it deviated from the earlier limits-to-growth perspective to focus more on achieving social and economic milestones, and their connection to environmental goals, particularly in developing countries. [7] [8] Sustainable development interconnects three socially concerned systems—environment, society and economy—a system seeking to achieve a range of goals as defined by the United Nations Development Program. [9]
The introduction of sustainable development into the environmental/economical discourse served as a middle ground for the limits-to-growth theory, and earlier pro-growth theories that argued maintaining economic growth would not hinder long-term sustainability. [7] As a result, scholars have faulted sustainable development for being too value-laden since applications of its definition vary heavily depending on relevant stakeholders, allowing it to be used in support of both pro-growth and pro-limitation perspectives of development arguments despite their vastly different implications. [7] In order for the concept to be effective in real-life applications, several specified frameworks for its use in various fields and industries, including sustainable construction, were developed.
The construction industry's response to sustainable development is sustainable construction. [1] In 1994, the definition of sustainable construction was given by Professor Charles J. Kibert during the Final Session of the First International Conference of CIB TG 16 on Sustainable Construction as "the creation and responsible management of a healthy built environment based on resource efficient and ecological principles". [10] Notably, the traditional concerns in construction (performance, quality, cost) are replaced in sustainable construction by resource depletion, environmental degradation and healthy environment. [11] Sustainable construction addresses these criteria through the following principles set by the conference: [11]
Additional definitions and frameworks for sustainable construction practices were more rigorously defined in the 1999 Agenda 21 on Sustainable Construction, published by the International Council for Research and Innovation in Building and Construction (CIB). [12] The same council also published an additional version of the agenda for sustainable construction in developing countries in 2001 to counteract biases present in the original report as a result of most contributors being from the developed world. [12]
Since 1994, much progress to sustainable construction has been made all over the world. According to a 2015 Green Building Economic Impact Study released by U.S. Green Building Council (USGBC), the green building industry contributes more than $134.3 billion in labor income to working Americans. The study also found that green construction's growth rate is rapidly outpacing that of conventional construction and will continue to rise. [13]
According to United Nations Environment Programme (UNEP), "the increased construction activities and urbanization will increase waste which will eventually destroy natural resources and wild life habitats over 70% of land surface from now up to 2032. " [14] Moreover, construction uses around half of natural resources that humans consume. Production and transport of building materials consumes 25 - 50 percent of all energy used (depending on the country considered). [15] Taking UK as an example, the construction industry counts for 47% of CO2 emissions, of which manufacturing of construction products and materials accounts for the largest amount within the process of construction. [5]
By implementing sustainable construction, benefits such as lower cost, environmental protection, sustainability promotion, and expansion of the market may be achieved during the construction phase. As mentioned in ConstructionExecutive, construction waste accounts for 34.7% of all waste in Europe. Implementing sustainability in construction would cut down on wasted materials substantially. [16]
Sustainable construction might result in higher investment at the construction stage of projects, the competition between contractors, due to the promotion of sustainability in the industry, would encourage the application of sustainable construction technologies, ultimately decreasing the construction cost. Meanwhile, the encouraged cooperation of designer and engineer would bring better design into the construction phase. [17]
Using more sustainable resources reduces cost of construction as there will be less water and energy being used for construction and with less resources being used in the projects, it would lead to lower disposal costs as there is less waste being made. [18]
By adopting sustainable construction, contractors would make the construction plan or sustainable site plan to minimize the environmental impact of the project. According to a study took place in Sri Lanka, [20] considerations of sustainability may influence the contractor to choose more sustainable, locally sourced products and materials, and to minimize the amount of waste and water pollution. Another example is from a case study in Singapore, [21] the construction team implemented rainwater recycling and waste water treatment systems that help achieve a lower environmental impact.
According to "Sustainable Construction: Reducing the Impact of Creating a Building", the contractor in collaboration with the owner would deliver the project in a sustainable way. More importantly, the contractor would have known this was a key performance indicator for the client from day one, allowing them the opportunity to not tender for the work, should this not appeal to them. Moreover, "It also sends a clear message to the industry, 'sustainability is important to us' and this, especially within the government and public sectors can significantly drive change in the way projects are undertaken, as well as up-skilling the industry to meet this growing demand.
By promoting sustainable methods and products in daily work, the good result directly shows the public the positive effect of sustainable construction. Consequently, there would be potential to expand the market of sustainable concepts or products. According to a report published by USGBC, "The global green building market grew in 2013 to $260 billion, including an estimated 20 percent of all new U.S. commercial real estate construction."[ citation needed ]
Globally, construction industries are attempting to implement sustainable construction principles. Below are some examples of successful implementations of sustainable construction promotion on a national level. Also included are new technologies that could improve the application of sustainable construction.
The Government in Singapore has developed a Sustainable Construction Master Plan with the hope to transform the industrial development path from only focusing on the traditional concerns of "cost, time, and quality" to construction products and materials, to reduce natural resource consumption and minimize waste on site. With the expediting concern of the climate crisis, it is essential to keep in mind the importance of reducing energy consumption and toxic waste whilst moving forward with sustainable architectural plans. [25] [21]
The development of efficiency codes has prompted the development of new construction technologies and methods, many pioneered by academic departments of construction management that seek to improve efficiency and performance while reducing construction waste.
New techniques of building construction are being researched, made possible by advances in 3D printing technology. In a form of additive building construction, similar to the additive manufacturing techniques for manufactured parts, building printing is making it possible to flexibly construct small commercial buildings and private habitations in around 20 hours, with built-in plumbing and electrical facilities, in one continuous build, using large 3D printers. Working versions of 3D-printing building technology are already printing 2 metres (6 ft 7 in) of building material per hour as of January 2013 [update] , with the next-generation printers capable of 3.5 metres (11 ft) per hour, sufficient to complete a building in a week. [26] Dutch architect Janjaap Ruijssenaars's performative architecture 3D-printed building was scheduled to be built in 2014. [27]
Over the years, the construction industry has seen a trend in IT adoption, something it always found hard to compete with when paired against other fields such as, the manufacturing or healthcare industries. Nowadays, construction is starting to see the full potential of technological advancements, moving on to paperless construction, using the power of automation and adopting BIM, the internet of things, cloud storage and co-working, and mobile apps, implementation of surveying drones, and more. [28] [29]
In the current trend of sustainable construction, the recent movements of New Urbanism and New Classical architecture promote a sustainable approach towards construction, that appreciates and develops smart growth, architectural tradition and classical design. [30] This is in contrast to modernist and short-lived globally uniform architecture, as well as opposing solitary housing estates and suburban sprawl. [31] Both trends started in the 1980s.
Timber is being introduced as a feasible material for skyscrapers (nicknamed "plyscrapers") thanks to new developments incorporating engineered timber, whose collective name is "mass timber" and includes cross-laminated timber. [32]
Industrial hemp is becoming increasingly recognised as an eco-friendly building material. It can be used in a range of ways, including as an alternative to concrete (known as 'hempcrete'), flooring, and insulation. King Charles is reported to have used hemp to insulate an eco-home. In December 2022, the United Nations Conference on Trade and Development (UNCTAD) emphasised hemp's versatility and sustainability, and advocated its use as a building material, in a report entitled 'Commodities at a glance: Special issue on industrial hemp'.[ citation needed ]
Specific parameters are needed for sustainable construction projects in developing countries. Scholar Chrisna Du Plessis of the Council for Scientific and Industrial Research (CSIR) defines the following key issues as specific to work in developing countries: [12]
In a later work, Du Plessis furthers the definition for sustainable construction to touch on the importance of sustainability in social and economic contexts as well. [33] This is especially relevant in construction projects in the Global South, where local value systems and social interactions may differ from the western context in which sustainable construction frameworks were developed. [33]
First, the need for sustainable development measures in developing countries is considered. Most scholars have reached a consensus on the concept of the 'double burden' placed on developing countries as a result of the interactions between development and the environment. Developing countries are uniquely vulnerable to problems of both development (resource strain, pollution, waste management, etc.) and under-development (lack of housing, inadequate water and sanitation systems, hazardous work environments) that directly influence their relationship with the surrounding environment. [34] Additionally, scholars have defined two classes of environmental problems faced by developing countries; 'brown agendas' consider issues that cause more immediate environmental health consequences on localized populations, whereas 'green agendas' consider issues that address long-term, wide-scope threats to the environment. [34] [35] Typically, green agenda solutions are promoted by environmentalists from developed, western countries, leading them to be commonly criticized as being elitist and ignorant to the needs of the poor, especially since positive results are often delayed due to their long-term scope. [35] Scholars have argued that sometimes these efforts can even end up hurting impoverished communities; for example, conservation initiatives often lead to restrictions on resource-use despite the fact that many rural communities rely on these resources as a source of income, forcing households to either find new livelihoods or find different areas for harvesting. [36] General consensus is that the best approaches to sustainable construction in developing countries is through a merging of brown and green agenda ideals. [34] [35]
Since all of the definitions and frameworks for the major concepts outlined previously are developed by large international organizations and commissions, their research and writings directly influence the organization, procedures, and scale of rural development projects in the Global South. Attempts at community development by foreign organizations like the ones discussed have questionable records of success. For instance, billions of dollars of aid have flowed into Africa over the past 60 years in order to address infrastructure shortcomings, yet this aid has created numerous social and economic problems without making any progress toward infrastructure development. [37] One compelling explanation for why infrastructure projects as a result of foreign aid have failed in the past is that they are often eurocentric in modelling and applied off successful strategies used in western countries without adapting to local needs, environmental circumstances and cultural value systems. [38]
Often NGOs and development nonprofits are criticized for taking over responsibilities that are traditionally carried out by the state, causing governments to become ineffective in handling these responsibilities over time. Within Africa, NGOs carry out the majority of sustainable building and construction through donor-funded, low-income housing projects. [37]
Currently, sustainable construction has become mainstream in the construction industry. The increasing drive to adopt a better way of construction, stricter industrial standards and the improvement of technologies have lowered the cost of applying the concept, according to Business Case For Green Building Report. [17] The current cost of sustainable construction may be 0.4% lower than the normal cost of construction.
Sustainable development is an approach to growth and human development that aims to meet the needs of the present without compromising the ability of future generations to meet their own needs. The aim is to have a society where living conditions and resources meet human needs without undermining planetary integrity. Sustainable development aims to balance the needs of the economy, environment, and social well-being. The Brundtland Report in 1987 helped to make the concept of sustainable development better known.
Infrastructure is the set of facilities and systems that serve a country, city, or other area, and encompasses the services and facilities necessary for its economy, households and firms to function. Infrastructure is composed of public and private physical structures such as roads, railways, bridges, tunnels, water supply, sewers, electrical grids, and telecommunications. In general, infrastructure has been defined as "the physical components of interrelated systems providing commodities and services essential to enable, sustain, or enhance societal living conditions" and maintain the surrounding environment.
Appropriate technology is a movement encompassing technological choice and application that is small-scale, affordable by its users, labor-intensive, energy-efficient, environmentally sustainable, and locally autonomous. It was originally articulated as intermediate technology by the economist Ernst Friedrich "Fritz" Schumacher in his work Small Is Beautiful. Both Schumacher and many modern-day proponents of appropriate technology also emphasize the technology as people-centered.
Green building refers to both a structure and the application of processes that are environmentally responsible and resource-efficient throughout a building's life-cycle: from planning to design, construction, operation, maintenance, renovation, and demolition. This requires close cooperation of the contractor, the architects, the engineers, and the client at all project stages. The Green Building practice expands and complements the classical building design concerns of economy, utility, durability, and comfort. Green building also refers to saving resources to the maximum extent, including energy saving, land saving, water saving, material saving, etc., during the whole life cycle of the building, protecting the environment and reducing pollution, providing people with healthy, comfortable and efficient use of space, and being in harmony with nature. Buildings that live in harmony; green building technology focuses on low consumption, high efficiency, economy, environmental protection, integration and optimization.’
Sustainable urban infrastructure expands on the concept of urban infrastructure by adding the sustainability element with the expectation of improved and more resilient urban development. In the construction and physical and organizational structures that enable cities to function, sustainability also aims to meet the needs of the present generation without compromising the capabilities of the future generations.
An eco-city or ecocity is "a human settlement modeled on the self-sustaining resilient structure and function of natural ecosystems", as defined by Ecocity Builders. Simply put, an eco-city is an ecologically healthy city. The World Bank defines eco-cities as "cities that enhance the well-being of citizens and society through integrated urban planning and management that harness the benefits of ecological systems and protect and nurture these assets for future generations". Although there is no universally accepted definition of an 'eco-city', among available definitions, there is some consensus on the basic features of an eco-city.
Leadership in Energy and Environmental Design (LEED) is a green building certification program used worldwide. Developed by the non-profit U.S. Green Building Council (USGBC), it includes a set of rating systems for the design, construction, operation, and maintenance of green buildings, homes, and neighborhoods, which aims to help building owners and operators be environmentally responsible and use resources efficiently.
Life-cycle engineering (LCE) is a sustainability-oriented engineering methodology that takes into account the comprehensive technical, environmental, and economic impacts of decisions within the product life cycle. Alternatively, it can be defined as "sustainability-oriented product development activities within the scope of one to several product life cycles." LCE requires analysis to quantify sustainability, setting appropriate targets for environmental impact. The application of complementary methodologies and technologies enables engineers to apply LCE to fulfill environmental objectives.
A green-collar worker is a worker who is employed in an environmental sector of the economy. Environmental green-collar workers satisfy the demand for green development. Generally, they implement environmentally conscious design, policy, and technology to improve conservation and sustainability. Formal environmental regulations as well as informal social expectations are pushing many firms to seek professionals with expertise with environmental, energy efficiency, and clean renewable energy issues. They often seek to make their output more sustainable, and thus more favorable to public opinion, governmental regulation, and the Earth's ecology.
Regenerative design is an approach to designing systems or solutions that aims to work with or mimic natural ecosystem processes for returning energy from less usable to more usable forms. Regenerative design uses whole systems thinking to create resilient and equitable systems that integrate the needs of society with the integrity of nature. Regenerative design is an active topic of discussion in engineering, landscape design, food systems, and community development.
Ecological design or ecodesign is an approach to designing products and services that gives special consideration to the environmental impacts of a product over its entire lifecycle. Sim Van der Ryn and Stuart Cowan define it as "any form of design that minimizes environmentally destructive impacts by integrating itself with living processes." Ecological design can also be defined as the process of integrating environmental considerations into design and development with the aim of reducing environmental impacts of products through their life cycle.
Green growth is a concept in economic theory and policymaking used to describe paths of economic growth that are environmentally sustainable. It is based on the understanding that as long as economic growth remains a predominant goal, a decoupling of economic growth from resource use and adverse environmental impacts is required. As such, green growth is closely related to the concepts of green economy and low-carbon or sustainable development. A main driver for green growth is the transition towards sustainable energy systems. Advocates of green growth policies argue that well-implemented green policies can create opportunities for employment in sectors such as renewable energy, green agriculture, or sustainable forestry.
Environmentally sustainable design is the philosophy of designing physical objects, the built environment, and services to comply with the principles of ecological sustainability and also aimed at improving the health and comfort of occupants in a building. Sustainable design seeks to reduce negative impacts on the environment, the health and well-being of building occupants, thereby improving building performance. The basic objectives of sustainability are to reduce the consumption of non-renewable resources, minimize waste, and create healthy, productive environments.
A sustainability organization is (1) an organized group of people that aims to advance sustainability and/or (2) those actions of organizing something sustainably. Unlike many business organizations, sustainability organizations are not limited to implementing sustainability strategies which provide them with economic and cultural benefits attained through environmental responsibility. For sustainability organizations, sustainability can also be an end in itself without further justifications.
A circular economy is a model of resource production and consumption in any economy that involves sharing, leasing, reusing, repairing, refurbishing, and recycling existing materials and products for as long as possible. The concept aims to tackle global challenges such as climate change, biodiversity loss, waste, and pollution by emphasizing the design-based implementation of the three base principles of the model. The main three principles required for the transformation to a circular economy are: designing out waste and pollution, keeping products and materials in use, and regenerating natural systems. CE is defined in contradistinction to the traditional linear economy.
Sustainable urbanism is both the study of cities and the practices to build them (urbanism), that focuses on promoting their long term viability by reducing consumption, waste and harmful impacts on people and place while enhancing the overall well-being of both people and place. Well-being includes the physical, ecological, economic, social, health and equity factors, among others, that comprise cities and their populations. In the context of contemporary urbanism, the term cities refers to several scales of human settlements from towns to cities, metropolises and mega-city regions that includes their peripheries / suburbs / exurbs. Sustainability is a key component to professional practice in urban planning and urban design along with its related disciplines landscape architecture, architecture, and civil and environmental engineering. Green urbanism and ecological urbanism are other common terms that are similar to sustainable urbanism, however they can be construed as focusing more on the natural environment and ecosystems and less on economic and social aspects. Also related to sustainable urbanism are the practices of land development called Sustainable development, which is the process of physically constructing sustainable buildings, as well as the practices of urban planning called smart growth or growth management, which denote the processes of planning, designing, and building urban settlements that are more sustainable than if they were not planned according to sustainability criteria and principles.
The World Resources Forum (WRF) is a non-profit organisation for sharing knowledge about the economic, political, social and environmental implications of global resource use. WRF promotes resource productivity among researchers, policymakers, business, NGOs and the public. In addition to organizing international and regional conferences, the WRF Secretariat coordinates multistakeholder dialogue projects, amongst others the Sustainable Recycling Initiative (SRI) as well as the H2020 projects Towards a World Forum on Raw Materials (FORAM), and CEWASTE. The WRF contributes to other EC-projects and projects with the German development organisation GiZ, UNEP and UNIDO.
Eco-industrial development (EID) is a framework for industry to develop while reducing its impact on the environment. It uses a closed loop production cycle to tackle a broad set of environmental challenges such as soil and water pollution, desertification, species preservation, energy management, by-product synergy, resource efficiency, air quality, etc.
Natural capital accounting is the process of calculating the total stocks and flows of natural resources and services in a given ecosystem or region. Accounting for such goods may occur in physical or monetary terms. This process can subsequently inform government, corporate and consumer decision making as each relates to the use or consumption of natural resources and land, and sustainable behaviour.
Sustainable Materials Management is a systemic approach to using and reusing materials more productively over their entire lifecycles. It represents a change in how a society thinks about the use of natural resources and environmental protection. By looking at a product's entire lifecycle new opportunities can be found to reduce environmental impacts, conserve resources, and reduce costs.