There has been large-scale proliferation in construction of buildings worldwide due to population growth, economic development, urbanization and migration. According to UN Habitat, there has been a migration of the world's population from rural areas to cities or smaller urban areas. In fact, this trend is expected to continue and cities within the developed as well as developing nations are expected to grow in terms of population. As a result all forms of construction activities are expected to become more intense than ever in the years to come.
Usually the development of urban areas suffers from weak process of planning and control which lead to bad housing conditions, poor sanitation system, limited electricity and water supply, and often poverty. These issues coupled with high population growth rate, environmental degradation, global warming and limited non-renewable resources highlights the importance of sustainable housing for the survival of humankind.
Sustainability in Buildings
Building construction and operation have extensive direct and indirect impacts on the environment. Buildings use resources such as energy, water and raw materials, generate a variety of wastes and emit potentially harmful gases. Basically the environmental impacts of buildings take place within six stages of building lifecycle:
- Design process
- Material or product manufacture
- Construction phase
- Refurbishment or demolition
In terms of energy consumption, 60 percent of the world’s electricity is consumed by residential and commercial building. Space heating accounts for 60 percent of residential energy consumption and water heating for 18 percent in developed countries. Therefore radical changes must be made in design and performance of the buildings to reduce energy consumption and its corresponding environmental impact.
In many countries, sustainable construction methods are being adopted to lead the building industry towards sustainable development and provide better quality living environment. Basically sustainable building design and construction intend to diminish environmental impacts of building over its entire lifetime by paying attention to environmental, socio-economic and cultural issues.
Trends Around the World
The developed and developing world is facing sustainable housing and urbanization challenge in different ways. Currently industrialized countries are the highest contributor in CO2 emissions. However it is expected that developing countries will take the lead in global warming in the near future. Developing countries are experiencing fast-paced urbanization and at the same time slums and informal settlements are also expanding rapidly which makes development of sustainable housing a difficult proposition.
Countries around the world are taking steps towards implementing sustainable design in the building sector. However most of them are still far from reaching the intended targets. The major barriers in implementing energy efficiency in the building sector include:
- Economic and financial issues;
- Structural characteristics of political, economic and energy system; and
- Lack of awareness and information
However different countries adopt different approaches for sustainable construction and set different priorities, depending on their economic condition. Nations with high economic growth are developing sustainable buildings making use of latest technologies and innovations. In case of developing countries, social equality and economic sustainability are foremost considerations. In fact, developing countries are moving slowly or even negative towards adopting sustainable housing strategies.
As far as Middle East is concerned, economic considerations dominate for oil and gas-rich GCC countries as they protect their oil and gas export reserves by investing in new ways to boost energy efficiency and lower energy consumption. However for less-affluent countries, such as Jordan, lack of indigenous energy resources and high energy costs are the primary reasons for implementation of sustainable design strategies in buildings.