Solving the production and processing methods (PPMs) puzzle Author Charnovitz S. Date 2001 Source IUCN (ID: MON-067395) Publisher | Place of publication Program for the Study of International Organisation(s) (PSIO) | Geneva, Switzerland Pages 63 p. Document type Miscellaneous Language English Field of application International Subject Environment gen. Keyword Ecofriendly products/ecofriendly processes International trade