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An hypothesis is presented herein in which arguments are made that new productivity in today's southern ocean (7.4 \u00d7 10<jats:sup>13<\/jats:sup>g yr<jats:sup>\u22121<\/jats:sup>) is limited by iron deficiency, and hence the phytoplankton are unable to take advantage of the excess surface nitrate\/phosphate that, if used, could result in total southern ocean new production of 2\u22123 \u00d7 10<jats:sup>15<\/jats:sup> g C yr<jats:sup>\u22121<\/jats:sup>. As a consequence of Fe\u2010limited new productivity, Holocene interglacial CO<jats:sub>2<\/jats:sub> levels (preindustrial) are as high as they were during the last interglacial (\u2248 280 ppm). In contrast, atmospheric dust Fe supplies were 50 times higher during the last glacial maximum (LGM). Because of this Fe enrichment, phytoplankton growth may have been greatly enhanced, larger amounts of upwelled nutrients may have been used, and the resulting stimulation of new productivity may have contributed to the LGM drawdown of atmospheric CO<jats:sub>2<\/jats:sub> to levels of less than 200 ppm. Background information and arguments in support of this hypothesis are presented.<\/jats:p>","DOI":"10.1029\/pa005i001p00001","type":"journal-article","created":{"date-parts":[[2008,2,6]],"date-time":"2008-02-06T14:18:34Z","timestamp":1202307514000},"page":"1-13","source":"Crossref","is-referenced-by-count":1715,"title":["Glacial\u2010interglacial CO<sub>2<\/sub> change: The Iron Hypothesis"],"prefix":"10.1029","volume":"5","author":[{"given":"John H.","family":"Martin","sequence":"first","affiliation":[]}],"member":"13","published-online":{"date-parts":[[2010,5,4]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.4319\/lo.1982.27.5.0789"},{"key":"e_1_2_1_3_1","volume-title":"CEOSECS Atlantic Expedition: HydrographLc Data, 1972\u201373","author":"Bainbridge A. 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