title: Four key decades.
authors.forename: Nigel
authors.initials: N
authors.lastname: Williams
mesh_terms: D001272:Atmosphere / Q000737:chemistry*; D002245:Carbon Dioxide / Q000032:analysis*; D005843:Geography; D017752:Greenhouse Effect; D007391:International Cooperation; D011640:Public Policy
chemical_list: D002245:Carbon Dioxide