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It is likely that the eruption of these magmas was accompanied by the injection of large amounts of sulfur dioxide into the upper atmosphere, which may have led to global cooling and to expansion of the polar ice cap. The P-Tr extinction event may have been caused by a combination of acid rain and global cooling as well as rapid and extreme changes in sea level resulting from expansion of the polar ice cap.<\/jats:p>","DOI":"10.1126\/science.258.5089.1760","type":"journal-article","created":{"date-parts":[[2006,10,5]],"date-time":"2006-10-05T19:03:06Z","timestamp":1160074986000},"page":"1760-1763","source":"Crossref","is-referenced-by-count":366,"title":["Synchronism of the Siberian Traps and the Permian-Triassic Boundary"],"prefix":"10.1126","volume":"258","author":[{"given":"I. 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