title: Conservation Biology at twenty.
authors.forename: Gary K
authors.initials: GK
authors.lastname: Meffe
authors.forename: David
authors.initials: D
authors.lastname: Ehrenfeld
authors.forename: Reed F
authors.initials: RF
authors.lastname: Noss
mesh_terms: D003247:Conservation of Natural Resources / Q000379:methods / Q000639:trends*; D004505:Education, Nonprofessional; D010506:Periodicals as Topic / Q000639:trends*