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PETM is tied to vulcanism also, but did not qualify as one of the 5 great extinctions. As a geologist I believe there is a correlation with impacts and subsequent vulcanism later, through a delayed effect on the upper mantle. The impacts start a delayed triggering effect, releasing magma from deep in the upper mantle to the crust over a period of even millions of years. Of course, it is tough to prove.
AETM is another story. Not the slow build up of CO2 with a long period of high particulates, and added seismic clathrate blowout of gigantic proportions. This time the CO2 is totally from human causes, and much faster. The three 2009 tundra scientific reports and the Norwegian sea temperature report all indicate the vector of methane turnover at 10 times PETM and about 10% more methane than then. The IPCC has their heads in the sand after the ridicule they got for being overly conservative to some, like me, and alarmist to the majority of idiots who want to believe in a fairy tale.
The pressure will hold the methane hydrate, yeah sure. It is already slowly releasing down to 1200 feet with 1*F rise. 2*F rise in another hundred years will cause fast release. This added warming will cause +2*F and warmer deeper and deeper, faster and faster, with methane hydrate rapid releases.
The temperature rise on land and in the seas are just too fast for most life to adapt and eco-systems fail. I used to think it would stop at PETM minus 5*F, but now realize it will be PETM plus 5*F. I won't be around and neither will anyone else.
To me it is a crying shame that, first, nothing was done when we knew the horrors of being on the mammalian crash curve, sounded warning all this time, and nothing done. Then as more was known about AGW and warnings started, nothing was done also. It was a triumph when warnings went out about ozone loss, and the international community stopped most use of those chemicals that were causing the loss. That was because it wasn't too hard or costly, as the population and fossil fuel burning reductions needed.
I would like to think that we have not crossed that tipping point of tundra melt methane self release, but knowing methane hydrate sensitivity, and the fact that the high latitudes are now +10 to 12*F, and that another 1*F globally is in momentum, which will affect the poles more----we waited too long.
Just like we waited too long with overpopulation.
Just like the growth only economy on a finite planet and a culture of debt that will lead to very high inflation and world depression unknown in scope well preceding the general eco-collapses. The general stupidity, lust, and greed of one species, an effect on the biosphere like a bull let loose in a China Shop. I suppose it is like what was called "original sin" in Catholic School. The Garden Of Eden is being top cut, soil sterilized, depleted, poisoned, and burning, and there is no place to which humans can be cast out.
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"With every decision, think seven generations ahead of the consequences of your actions" Ute rule of life.
“We do not inherit the earth from our ancestors; we borrow it from our children”― Chief Seattle
“Those Who Have the Privilege to Know Have the Duty to Act”…Albert Einstein
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