The Green Building Council of Australia (GBCA) has launched the Green Star - Performance rating tool, a online option designed to assess the environmental friendliness of existing building stock. Accessible online, it's designed for use on all buidlings except detached single-family homes, and looks at energy, water, waste reduction, and indoor environmental quality. Romilly Madew, GBCA chief executive, calls it a "game changer." What do you think? Read More