It's not all doom and gloom and mass global extinction, however. (gamecritics.com)
This could be the first global extinction of megafauna — a creature larger than about 200 pounds (100 kilograms)-- for more than 50 years, since the disappearance of the Caribbean monk seal, the fourth disappearance of an entire mammal family since 1500, and the very first dolphin to face human - driven extinction. (treehugger.com)
«During the Late Permian (Figures 16 to 19) there was a major global extinction event which resulted in a large loss of species caused by catastrophic methane eruptions from destabilization of subsea methane hydrates in the Paleo - Arctic (Figures 16, 17 and 13a)(Wignall 2009) `` (ecoshock.org)