Industry sector (INDUSTRY) has been found to be a determinant of voluntary environmental disclosure in prior studies (Freedman and Jaggi, 2005). Accordingly, we include indicator variables for industries traditionally considered more environ-mentally sensitive (mining & metals; materials; energy; and industrials). Year indicator variables are included to control for macroeconomic effects, including of the Global Financial Crisis (GFC), which arguably reached the Australian market in 2009,reflected in 2010 financial reports, or on voluntary environmental disclosures. It is also important to control for YEAR since the NGER Act was implemented with decreasing emissions thresholds over 3 years (2009–11), drawing more affected com-panies under its purview each year until the threshold stabilised in fiscal year 2011.