The environmental benefits of green roofs have now been well documented, and include storm water retention, improved water quality and provision of a recycled water supply, evaporative cooling from plants, biofiltration of airborne pollutants, and increased carbon dioxide/oxygen exchange through photosynthesis.
Current research in Adelaide involves monitoring thermal performance, water quality and useage, and plant performance characteristics of extensive and intensive green roof beds on the 22nd level rooftop of ANZ House in Adelaide. Green roofs can minimise rising temperatures and the UHI in Australian cities, which would have a dramatic impact on public health, given that heat waves are now recognised as the nation's major natural disaster, ahead of bushfires and floods.
Graeme Hopkins and Christine Goodwin report