Prevention of food waste in the catering sector : guideline / publisher: German Environment Agency, section III 1.5 Municipal Waste, Hazardous Waste, Focal Point to the Basel Convention ; authors: Leonie Fink, Rainer Roehl, Dr. Carola Strassner (a'verdis Roehl & Dr. Strassner GbR) ; with contributions of Florian Antony and Carl-Otto Gensch (Öko-Institut e.V.) ; edited by: Barbara Friedrich