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On the basis of fundamental chemical and physical principles, we propose that climatic conditions enabling the existence of liquid water were maintained by appreciable atmospheric concentrations of volcanically degassed SO\n                    <jats:sub>2<\/jats:sub>\n                    and H\n                    <jats:sub>2<\/jats:sub>\n                    S. The geochemistry resulting from equilibration of this atmosphere with the hydrological cycle is shown to inhibit the formation of carbonates. We propose an early martian climate feedback involving SO\n                    <jats:sub>2<\/jats:sub>\n                    , much like that maintained by CO\n                    <jats:sub>2<\/jats:sub>\n                    on Earth.\n                  <\/jats:p>","DOI":"10.1126\/science.1147039","type":"journal-article","created":{"date-parts":[[2007,12,20]],"date-time":"2007-12-20T20:19:52Z","timestamp":1198181992000},"page":"1903-1907","source":"Crossref","is-referenced-by-count":181,"title":["A Sulfur Dioxide Climate Feedback on Early Mars"],"prefix":"10.1126","volume":"318","author":[{"given":"Itay","family":"Halevy","sequence":"first","affiliation":[{"name":"Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA."},{"name":"Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Maria T.","family":"Zuber","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA."},{"name":"Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel P.","family":"Schrag","sequence":"additional","affiliation":[{"name":"Department of Earth and Planetary Sciences, Harvard University, Cambridge, MA 02138, USA."},{"name":"Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"221","reference":[{"key":"e_1_3_1_2_2","doi-asserted-by":"publisher","DOI":"10.1029\/2002JE001963"},{"key":"e_1_3_1_3_2","doi-asserted-by":"publisher","DOI":"10.1023\/A:1011989004263"},{"key":"e_1_3_1_4_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.1113077"},{"key":"e_1_3_1_5_2","doi-asserted-by":"crossref","first-page":"173","DOI":"10.1016\/0019-1035(91)90017-N","volume":"91","year":"1991","unstructured":"J. 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