article_snippet.sent: Dr Mark Urban  studied data from 131 biodiversity studies to come to Dr Mark Urban   bleak conclusions, which are published in the journal, Science.
article_snippet.sent: In a separate study from the University of Berkeley in California, scientists examined extinction rates in fossils over 23 million years.
article_snippet.sent: Scientists at the University of California, Berkeley and other institutions examined fossils to determine which marine life is most at risk of dying out, based on previous rates of extinction.
article_snippet.sent: Dr Mark Urban from the University of California, Berkeley came to the conclusion by correlating information from 131 biodiversity studies.
article_snippet.sent: The researchers used patterns from the fossil record to assess the natural extinction risk of animals living in the oceans today.
article_snippet.sent: The detailed study examined 2,397 fossil types over the past 23 million years.
article_snippet.sent: The detailed study found that worldwide patterns of extinction remained remarkably similar over the whole period, with the same groups of animals showing similar rates of extinction.
article_snippet.sent: The detailed study used patterns from the fossil record to assess the natural extinction risk of animals living in the oceans today. 
article_snippet.sent: The detailed study examined 2,397 fossil genera over the past 23 million years across a variety of animal groups.
article_snippet.sent: The team then compared the 'natural' risk of extinction, based on historic evidence, with current threats from humans and climate change .
article_snippet.sent: ‘Our goal was to diagnose which species are vulnerable in the modern world, using the past as a guide,’ said lead author Dr Seth Finnegan, an assistant professor of integrative biology at UC Berkeley.