title: Early earth: faint young sun redux.
authors.forename: James F
authors.initials: JF
authors.lastname: Kasting
mesh_terms: D001272:Atmosphere / Q000737:chemistry; D002245:Carbon Dioxide / Q000032:analysis; D002980:Climate; D018534:Earth, Planet; D005615:Freezing; D017752:Greenhouse Effect; D049690:History, Ancient; D006859:Hydrogen / Q000032:analysis; D008962:Models, Theoretical; D010313:Partial Pressure; D013472:Sunlight; D014867:Water / Q000032:analysis* / Q000737:chemistry*
chemical_list: D014867:Water; D002245:Carbon Dioxide; D006859:Hydrogen