1. Sustainable development – Malaysia 2. Sustainable development – Environment aspects – Malaysia Cities have a metabolism that requires energy, food, materials and water to be supplied and waste products to be removed. If cities are to remain the engines of economic growth they also require an imput of knowledge as well as commodities. This fuels innovation and the skills of people and investment that require new buildings and the conservation of existing buildings. This, in turn, requires an imput of both building materials and the knowledge of manufacturing and assembling them efficiently and effectively.