The information below is from the Forest Stewardship Council (FSC) of Australia. This is the local branch of the global organisation at the fore-front of combating deforestation caused by unsustainable and illegal practices. They have the most stringent certification system in the world.
The Green Building Council of Australia (GBCA) along with most green building councils in the Western world only recognises FSC certification of timber products in their rating systems. In the case of the GBCA this is their Green Star Rating System which only recognises FSC and GECA certification.