“…Acquiring access to information about companies, however, can be very difficult. Compared with financial reporting, sustainability reporting is less developed (Edwards et al, 2002). Müller-Wenk (1978) suggested an environmental accounting system as much as 25 years ago and it was developed further worldwide (see, e.g., Rubenstein, 1994;Helminen, 2000;Tyteca et al, 2002).…”