IPCC RCP8.5 Projected Global Temperatures for 2081-2100
Climate change projected by the IPCC 2013 report under the business as usual scenario (RCP8.5) projects climate change in the next 100 years to be as big as the Paleocene/Eocene Thermal Maximum extinction event 56 million years ago. Changes today however are happening 100 times faster than the PETM. The PETM was likely a methane clathrate melt event where frozen methane (natural gas) on the ocean floor melted. The event happened over a time period of about 10,000 to 20,000 years and resulted in an extinction event centered on the world’s oceans. Nearly half of all life in the oceans perished as the methane melt increased ocean acidity beyond the threshold of life for those organisms. Ten million years before the PETM, a giant asteroid hit the Yucatan Peninsula and the dinosaurs, along with 75% of life on Earth, went extinct. Since the asteroid impact, mankind’s climate change stands alone. The dinosaur extinction event is difficult to compare with what is happening today. What happened 65 million years ago? That 6 mile wide asteroid blew out a crater 110 miles wide and threw enough dust in the atmosphere to block the sun for a year and photosynthesis failed. The red-hot ejecta from the impact fell back to Earth and burned most of the planet. What didn’t die during this cataclysm died from climate change caused by the massive increase in atmospheric carbon from vaporized rock and global fires. So climate change today is second in severity in the last 65 million years only to this extinction event which was the worst in 250 million years.
Source: climatediscovery
URL:     http://climatediscovery.com/one-hundred-times-faster-than-anything-in-65-million-years-the-speed-of-climate-change/
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