We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleThe early faint sun paradox: Organic shielding of ultraviolet-labile greenhouse gases.AuthorsSagan, Carl; Chyba, ChristopherPublicationScience, 1997, Vol 276, Issue 5316, p1217ISSN0036-8075Publication typearticleDOI10.1126/science.276.5316.1217