Note. The Opt-In Program Author Ferguson C.S. Journal/Series The Environmental Lawyer | Vol. 2(2); 487 - 503; 17 p. Date 1996 Source IUCN (ID: ANA-057835) Publisher | Place of publication The George Washington University National Law Center | Washington, DC, USA Language English Country/Territory United States of America Subject Air & atmosphere Keyword Subsidy/incentive Acid precipitation