Life On Earth To Die Out In One Billion Years
But ironically the end of the world is going to arrive as a result of too little carbon dioxide in the atmosphere, rather than too much.
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#1 Jul 1, 2013
Then leave the fossil fuels where they are to be used later.
#2 Jul 2, 2013
Every day, an airplane with contractors working for Taylor Energy Ltd. flies over a spot 12 miles south of the mouth of the Mississippi River looking for an oil sheen.
That spot was the doomed location of Taylor Energy's Mississippi Canyon 20-A production platform, which towered 550 feet above 28 producing oil and gas wells drilled in water 479 feet deep.
The platform and its pipelines disappeared on Sept. 15, 2004, when Hurricane Ivan crossed the area, accompanied by winds of 145 mph and waves estimated to be 71 feet high. The heavy pressure transferred to the ocean floor by those huge waves, which crossed the area once every 16.1 seconds at the height of the storm, caused a landslide that obliterated the platform.
The platform had been secured to the seabed by eight structural piles, according to a scientific report prepared for the federal Minerals Management Service. "It was subsequently located lying in an almost horizontal orientation and almost entirely buried in sediment up to 100 feet deep, approximately 900 feet from its original location and in approximately 440 feet of water," Taylor Energy officials said in papers filed in federal court as part of a lawsuit against the firm's insurance company.
In one of several underwater investigations that followed, three plumes of oil and gas were found seeping from the sea floor in the vicinity of both the well casings and the downed platform 900 yards away.
“Geologist [I'm Climate Change]”
Since: Mar 07
#4 Jul 3, 2013
I was looking for this one in the [Geology] or the [Astronomy] threads, but it is interesting to find even if it is in the wrong spot.
In this case the article is about the increasing insolation that results from the sun slowly evolving into a subgiant.
What is missing in the article is the application of atmospheric modelling on surface temperatures resulting from the increased insolation which will eventually produce a "steam bath" such as in the early history of Venus.
The Venereal "steam bath" is easy to trace as H2O is also a greenhouse gas, and its loss due to photolysis in the Early Cambrian timespan or thereabouts led to the cooling of venus' atmosphere to the point where the crust was no longer able to anneal and flow. The landscape under the H2SO4 clouds datable by cratering rates has been produced by convective drift & volcanism since the loss of the steam bath.
Have a nice day: Ag
#5 Jul 3, 2013
Carbon dioxide is very soluble in water (much more so than nitrogen and oxygen), and its absorption by the water could have been the reason why carbon dioxide did not build up to the lethal concentration of about 5%.
“Geologist [I'm Climate Change]”
Since: Mar 07
#6 Jul 8, 2013
The proof incidentally was during the End Permian mass extinction which resulted from the ending of an ice cap over the S. part of gondwana in the End permian coupled with the following:
1: the establishment of a dry monsoonal flow over the < shaped Pangaea supercontinent that had just been assembled (this monsoonal flow swept over both poles and not just melted but evaporated the ice Gondwana ice cap).
2: the eruption over the northern Horn of Pangaea of the "Siberian traps" large igneous province which filled the atmosphere with CO2 and dissolved a large amount of SO2 into the ocean.
The dry monsoonal flow forced the Earth into climate mode#2 which was very inefficient @ cooling the planet, Pangaea was mostly a dry desert, and the bulk of the rainfall was on the opposite side of the planet in the mid part of the Tethys-Pacific belt.
The global warming that resulted from the CO2 spike led to eutrophication of the deep ocean and a catastrophic release of Methane hydrate laid down during the prior Gondwana glacial episode of carboniferous-permian times. The result was a period of methane fires & more CO2 input. The ocean rich in dissolved CO2 and SO2 as a result dissolved large amounts of carbonate leading to the extinction of numerous shallow water tropical species that had previously survived the drying of Pangaea and the eutrophication of the deep ocean.
The scenario actually was quite close to the disastrous global warming scenario used by the AGW protestors via the rather limited Jason model which also runs according to climate mode#2,(Bizarre isn't it?). In this case climate mode#2 was forced by the < shape of the pangaea supercontinent allowing dry hot monsoonal flow over both polar regions direct from the equator.
Following the shutdown of the Siberian traps, the SO2 content of the oceans dropped (mostly becoming neutral-alkaline H2S in the deep ocean). The Oceans as a result of the loss of periodic input of CO2 and also the bulk loss of H2SO4 became oversaturated in Calcium and in a small part Na, K, Mg, and Fe. The result immeditely after the end Permian mass extinction was a global precipitation of inorganic crystalline carbonate deposits (many with nice spiky edges) from an alkaline "seltzer" ocean (the pH change itself would have prompted further oceanic extinctions), which shows up as a layer in any basin showing the Permian-Triassic boundary.
Similar "Seltzer" precipitation shows up in several African rift valley lakes near the tanzanian carbonatite volcanoes, the most extreme being lake Natron.
For the record, CO2 levels would have been well above the 5% human lethality levels during the dissolution stage, and would have dropped only during the "Seltzer" crystallisation stage at the end of the mass extinction.
As for life in general, Humans are relatively fragile, Birds have a higher CO2 tolerance (Handy for their ancestors, the Dinos which became prominent in the Triassic).
Have a nice day: Ag
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