We are celebrating now 20 years of the Austrian Environmental Sign. At the beginning this environmental effort for printing was mainly designed for traditional printing and 20 years ago we started with traditional printing shops in Austria. The outlines were only designed for traditional offset printing and in the beginning 4 printing plants could fulfill the standards of the regulations.2011 there are 56 printing facilities certified and out of this number 30% percent of the plants are using digital printing.
Werner Sobotka, "The Impact of 20 Years Environmental Certification on the Shift from Traditional to Digital Printing" in Proc. IS&T Int'l Conf. on Digital Printing Technologies and Digital Fabrication (NIP27), 2011, pp 726 - 727, https://doi.org/10.2352/ISSN.2169-4451.2011.27.1.art00082_2