title: Earth sciences: ups and downs of ancient oxygen.
authors.forename: James F
authors.initials: JF
authors.lastname: Kasting
mesh_terms: D001272:Atmosphere / Q000737:chemistry*; D005075:Biological Evolution; D002255:Carbonic Acid / Q000378:metabolism; D005844:Geology; D049690:History, Ancient; D010100:Oxygen / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism*; D010788:Photosynthesis; D013997:Time Factors
chemical_list: D002255:Carbonic Acid; D010100:Oxygen