Schopf, JW, Kudryavtsev, AB, Czaja, AD, and Tripathi, AB | |
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The figure "about one-half of one percent" takes into account the following See, e | Evidence of Archean life: Stromatolites and microfossils |
325 1228 : 469—76, discussion 476—7 | Proc Natl Acad Sci USA |
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"The current biodiversity extinction event: scenarios for mitigation and recovery" | Peter Hamilton Raven; George Brooks Johnson 2002 |
Philos Trans R Soc Lond B Biol Sci | Proc Natl Acad Sci USA |
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Reston, VA: Department of the Interior, Geological Survey | Hugh Anderson, Bernard Walter March, 28 1997 |