b'A GLOBAL PROBLEM: THE IMPORTANCE OF USING SUSTAINABLE BUILDING MATERIALSBeyond Australia, the global construction sector is responsibleconstruction, concrete and steel as well as brick are some of for much of the worlds natural resource consumption, wastethe highest contributors of embodied emissions. 7Other studies and greenhouse gas emissions. Building construction consumesshow cement and steel accounting for almost half of industrial 30-50% of the planets raw materials. 4Construction alsoemissions 8and a significant proportion of industrial water use. generates massive amounts of waste with reports predicting an increase to 2.2 billion tonnes of global construction waste perIn light of the publics growing environmental awareness, year by 2025. 4According to the International Energy Agency,the construction industry is seeking ways to reduce its buildings and building construction are also accountable forenvironmental impact. One approach is identifying sustainable approximately 36% of global final energy consumption and 40%alternatives to concrete, brick and steel that are suitable for a of total CO2 emissions (direct and indirect). 6 wide range of building typesfrom small residential dwellings to high-rise commercial skyscrapers. High quality, certified-The environmental impact of construction can be partlysustainable timber and engineered timber products may provide attributed to the continued use of polluting technologies sucha viable, long-term solutionas steel and concrete. Among the commonly used materials in DEVELOPMENTS IN SUSTAINABLE BUILDING DESIGNThe goal of sustainable design is to minimise negativecommercial sector, including faster, more cost-effective carbon-environmental impacts at both the construction and useneutral construction. The light weight of CLT decreases foundations stages. 9A key component of sustainable design is usingloads and makes CLT panels easy to work with and erect at environmentally-friendly building materials whenever possibleany height. Pre-manufactured CLT elements can also reduce while also implementing measures to improve the health andconstruction timeframes, allow for more economical foundations wellbeing of occupants.and improve access for follow-on trades. Furthermore, building elements made of CLT can be combined with other materials such A sustainable approach to building design benefits occupants,as glulam beams, enabling a high degree of design flexibility.the general public and the construction industry alike. Such benefits include: 10 New mass engineered timber solutions, such as CLT, have been specifically engineered for maximum strength andreduced energy costs over the lifetime of a building; portability. 11Demonstrating its structural capabilities, CLT hasbetter use of natural resources (e.g. through reuse, recyclingbeen used in major high rise buildings in Australia, such as and responsible disposal); Forte Living in Victoria, the tallest residential timber building;environmental protection outcomes; and the award-winning Inernational House Living building inimproved occupant health and quality of life. Barangaroo, Sydney; and 25 King St in Brisbane, which is the first, largest and tallest timber office. As it combines the Developments in material technology have had a major impact oninherent sustainability of timber with enhanced versatility and sustainable design. For example, Cross Laminated Timber (CLT), astrength, CLT is considered by some commentators to be a next generation engineered wood product with enhanced structuralviable solution that could permanently replace older polluting properties, has opened up new architectural possibilities within theconstruction technologies. 12'