We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleHigh CO2 levels in the Proterozoic atmosphere estimated from analyses of individual microfossils.AuthorsKaufman AJ; Xiao SPublicationNature, 2003, Vol 425, Issue 6955, p279ISSN1476-4687Publication typearticleDOI10.1038/nature01902