RUMBA Coordination Group, 2011 Environment Report of the Federal Administration, 2011, p. 3 ([Internet, 2022-01-11](https://www.rumba.admin.ch/dam/rumba/de/dokumente/bv/umweltbericht_2011derbundesverwaltung-zieleundresultate1.pdf.download.pdf/2011_environmentreportofthefederaladministration-objectivesandre.pdf))