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When Life Nearly Died: The Greatest Mass Extinction of All Time by Michael Benton

When Life Nearly Died: The Greatest Mass Extinction of All Time Michael Benton ebook
Format: pdf
Publisher: W W Norton & Co Inc
ISBN: 9780500285732
Page: 336

Scientists say CO2 from volcanic eruptions wiped out nearly all living species 200 million years ago. It is common for species that prove not to be evolutionarily fit to eventually die off. Members of the Climate Central staff and board are among the most respected leaders in climate science. Given the near-consensus mechanism of a big ole rock smacking down near the current-day Mexican Riviera,..probably the big dinos died quickly and smaller ones petered out over time. I will not spend my life having my work judged very good/excellent/outstanding and nevertheless fail. Without this cycle of extinction and speciation life on earth would be static and unchanging, which the fossil records have proved untrue (Freeman 316). Once we put all that together we can produce our optimistic forecast of how long our Hollow Scene Mass Extinction Event will take to play out for us parochial, self-absorbed spinal column-possessing types. And I don't think species replace nearly as quickly as they die off. It is crucial to understand what makes normal extinction different from a mass extinction; a mass extinction is due to some kind of catastrophe that wipes out at least three quarters of all living species at one time. Scientists have found the hottest temperature the planet has ever experienced may have helped cause the greatest die-off in history at the end of the Permian Era some 250 million years ago. Until the norm returns to ~1/3 funded:~1/3 funded after revision:~1/3 hopeless, American science will continue to die on the vine. The next great extinction was in the Late Devonian (≈364 Mya), when 22% of marine families and 57% of marine genera, including nearly all jawless fishes, disappeared. Today, thanks to greenhouse gases from the burning of fossil fuels; deforestation and other changes wrought by human activity, biologists believe a sixth great extinction is under way. Feverishly hot ocean One key factor behind this disaster was probably catastrophic volcanic activity in what is now Siberia that spewed out as much as 2.7 million square miles (7 million square kilometers) of lava, an area nearly as large as Australia. Staff members are authorities in communicating .