We are headed, directly into Mass Extinction Event 6, to challenge for a place, among the top killers, of all geologic time.
Most of the Greenland ice sheet just melted. This hasn't happened, since 1889. No big whoop?
The Greenland ice sheet melt previous, to the 1889 melt apparently happened, in the Medieval Warm Period, so a lot of writers are claiming no trend is evident, except toward a modern warm period, which means such melts will be a lot more common, than every thousand or hundred years, but more like every couple of years, then every year, since we are at a tipping point, toward that sort of phenomenon.
Here's a skeptic site, which did notice, how Erik the Red experienced such a melt, but this site noted certain oysters are no longer living, in such northern climes, without noting how this is because CO2 IS ACIDIFYING THE OCEANS, particularly toward the poles:
http://www.green-agenda.com/greenland.html
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http://www.dailytech.com/article.aspx?newsid=25257
These guys inaccurately reported that the melt happens "every 150 years." They missed a lot. So these other guys are starting to go over all of this:
http://thinkprogress.org/climate/20...ted-absolutely-is-it-worrisome-you-bet-it-is/
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What happened is the reporters of this event are now trying to figure out, how often it really has happened, in the past, but nobody reported on what happened, during the PETM extinction or the P-T extinction, which is where we are headed, from much faster GHG emissions and out-gassing, than either of these warming-related extinctions.
The oceans acidify, to badly injure the food chain, then they heat up, sea levels rise, anoxic events kill other life forms, and on the way, jellyfish take over. NS2 respirators evolve. Failure of species and families will be epic:
http://en.wikipedia.org/wiki/Permian–Triassic_extinction_event
http://www.cgd.ucar.edu/ccr/aboutus/staff/kiehl/Kiehl-Shields.pdf
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http://climatesight.org/2011/02/17/extinction-and-climate/
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http://www.skepticalscience.com/co2-rising-ten-times-faster-than-petm-extinction.html
http://www.wunderground.com/climate/PETM.asp
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First up:
http://www.realclimate.org/index.ph...an-the-other-problem-with-cosub2sub-emission/
All that cold water, from melting Greenland and Arctic ice carries carbonic acid, which will make the ocean less basic, so it averages pH 8.1, when at the end of the 18th Century, it was pH 8.2. Seems like not too much, right? That is about a 30% increase, in acidity, enough to spike, at pH 7.7, so eggs, little fish, corals, and oysters DIE. The food chain can fail, from this, before the oceans heat up!
And by then, most desirable ocean species will be dead.
We will be in the middle, of MASS EXTINCTION EVENT 6, which will challenge the P-T extinction, for top killer, of all geologic time.