Buildings and Climate Change: Status, Challenges, and Opportunities

Oslo (March 29, 2007)- The United Nations Environmental Programme published the report “Buildings and Climate Change: Status, Challenges, and Opportunities” detailing the role of public entities in an overall lack of progress in greening urban development. The report says more than one fifth of present energy consumption could be saved by 2010 by applying more ambitious standards to new and existing development, including the use of existing technologies like solar shading, more efficient lighting, greenscaping, and development practices including public transportation, urban density, and infill and mixed used development.


The right mix of appropriate government regulation, greater use of energy saving technologies and behavioural change can substantially reduce carbon dioxide (CO2) emissions from the building sector which accounts for 30-40 % of global energy use, says a new report from the United Nations Environment Programme (UNEP) Sustainable Construction and Building Initiative (SBCI).
“This report focuses on the building sector. By some conservative estimates, the building sector world-wide could deliver emission reductions of 1.8 billion tonnes of C02. A more aggressive energy efficiency policy might deliver over two billion tonnes or close to three times the amount scheduled to be reduced under the Kyoto Protocol,” he added.
“There is more low hanging fruit to be harvested. Several countries, including Australia, Cuba and the European Union are looking to phase out or ban the traditional incandescent light bulb that has been around for well over a century in various forms. The International Energy Agency estimates that a total global switch to compact fluorescent bulbs would, in 2010 deliver C02 savings of 470 million tonnes or slightly over half of the Kyoto reductions. We have to ask what the hurdles are– if any–to achieving such positive low cost change and set about decisively and swiftly to overcome them, if they exist at all,” said Mr Steiner.
Key Points from the Buildings and Climate Change Report:
* In the life time of an average building most energy is consumed, not for construction, but during the period when the building is in use. That is, when energy is being used for heating, cooling, lighting, cooking, ventilation and so on. Recognizing this, the report pushes for a greater use of existing technologies like thermal insulation, solar shading and more efficient lighting and electrical appliances, as well as the importance of educational and awareness campaigns. Typically more than 80% of the total energy consumption takes place during the use of buildings, and less than 20% during construction of the same.
* To achieve improved energy efficiency in buildings you often do not need to use advanced and expensive high-tech solutions, but simple solutions such as smart design, flexible energy solutions and provision of appropriate information to the building users. Simple solutions can include sun shading and natural ventilation, improved insulation of the building envelope, use of recycled building materials, adoption of the size and form of the building to its intended use etc. Of course you can achieve even better results if more sustainable construction system solutions are used, such as intelligent lighting and ventilation systems, low temperature heating and cooling systems and energy saving household appliances.
* In addition to a greater use of relevant energy saving technologies, the report stresses the importance of appropriate government policies on building codes, energy pricing and financial incentives that encourage reductions in energy consumption.
* It also emphasizes that the building sector stakeholders themselves, including investors, architects, property developers, construction companies, tenants, etc. need to understand and support, such policies in order for them to function effectively.
* The report also notes that approaches to finding building solutions will vary.
* In developed countries the main challenge is to achieve emission reduction among mostly existing buildings, and this can largely be done by reducing the use of energy. In other parts of the world, especially places like China where almost 2 billion square meters of new building space is added every year, the challenge is to leapfrog directly to more energy efficient building solutions, the report says.
Related Resources:
Buildings and Climate Change: Status, Challenges, and Opportunities
United Nations Environmental Programme