Ice
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hivewired.wordpress.com
https://www.youtube.com/watch?v=wJo8m4oKc6k
https://www.youtube.com/watch?v=i1BFb_uYlFQ
https://www.youtube.com/watch?v=w7eqBtc2tv0
And then you can come to your own conclusions on whether or not you believe in the meteor impact theory, rapid destabilization theory, etc. But, I have a feeling the solution is simpler. It only takes one tiny stream of water to make it's way through the glacier and start eroding away at it. If you've seen videos of dams collapsing, they also start from the smallest of trickles which quickly turns into a feedback loop of more erosive power.
https://en.m.wikipedia.org/wiki/Younger_Dryas
There is evidence of Geothermal activity under the Antarctic ice sheet. Why is magma not on the table for glacial melting? See NASA article below:
https://www.jpl.nasa.gov/news/news.php?feature=6996
By the way the Antarctic ice sheet is currently at median levels (based on 1981-2010 baseline): https://nsidc.org/data/seaice_index/
The article also mentions 1m of sea level rise before 2100. There is no evidence of sea level rise acceleration. It is averaging 3.3 mm per year since 1993. Assuming there is not a cyclical downtrend in sea level (likely sometime this century, given grand solar minimum odds or chance of a major volcanic event), that would only amount to just under a foot per century of sea level rise. Source: https://climate.nasa.gov/vital-signs/sea-level/
Another possibility is abrupt changes in the flow of large bodies of waters affecting ocean circulation causing climate changes. One hypotheses is as the glaciers retreated the waters of the Missisppi river switched to flowing out of the St Lawrence river affecting North Atlantic currents.
[0] https://www.climate.gov/news-features/understanding-climate/...
The use of the word 'trace' here seems to be weasel words. Doesn't matter if it's trace or not. Otherwise it's an interesting point.
> There is no evidence of sea level rise acceleration
As you back up all your other stats, why not this one. A bit of searching suggests you're wrong (multiple reputable sources are given in the article, from nasa + vims + noaa)
"Of 32 tide-gauge stations in locations along the vast US coastline, 25 showed a clear acceleration in sea level rise last year" (and there's more there)
https://www.theguardian.com/environment/2020/feb/03/sea-leve...
I'm getting tired of these posts. We're facing a threat to our very existence, facts matter.
Careful: ice sheet != sea ice. The formation of sea ice is strongly dependant upon underlying sea temperature & exposure to daytime sun & nightime radiational cooling. Ice sheets form on land due to snowfall. Most of the Antarctic sea-ice disappears every year in the southern hemisphere summer.
Our track record for noticing near Earth objects is pretty poor and largely due to amateur astronomers. I don't think there is any consensus on what sort of space mission we could mount to divert one either. We are a long way from "planetary defenses have never been stronger": https://youtu.be/QkpP5Nz7zuY?t=34
My mother[0] was a geologist, and I was raised in an environment, where she was constantly pointing at rocks and terrain, telling me about how they were formed.
I live on Long Island, New York, which is called a “terminal moraine.”[1]
I.e. “glacier poop.”
When you realize that Long Island is 125 miles long, you can appreciate the size of the glacier that created it.
The Ice Age was AWESOME.
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There is a page switcher at the bottom of the article where you need to manually go to the next page to read more.
The whole younger Dryas advanced civilization think could have been avoided entirely and the point about ice melt rates would have been fine.
We still don't have any evidence of early, drowned civilizations, but the comet strike now seems to be responsible for extinctions in both South America and Africa. As an aside, you don't need a crater. Multiple airbursts over a wide area, Tunguska style, provide plenty of devastation.
You might be able to believe in mass extinctions caused by newly arrived humans in South America, but explaining the African ones the same way ought to get you funny looks. The more you think about that, the less plausible human responsibility for the American extinctions becomes.
This is a great rebuttal of the whole YDIH.
Specifically regarding the possibility of air bursts, (0) says this:
The firestorm began in 2007 when Richard Firestone and numerous colleagues proposed that it was a comet strike of “multiple ET [extraterrestrial] airbursts along with surface impacts” that occurred at 12,900 years ago that initiated the YD.”23 The paper was full of impressive evidence gathered from 10 sites where a carbon-rich layer (referred to as the “black mat”) marked what they claimed was the end of the Clovis culture in North America: “The in situ bones of extinct Pleistocene megafaunas, along with Clovis tool assemblages, occur below this black layer but not within or above it.” They reported that sediments directly below the black mat were enriched in magnetic grains, iridium, magnetic microspherules, charcoal, soot, carbon spherules, glass-like carbon containing nanodiamonds and fullerenes containing extraterrestrial helium. They explained that the soot, charcoal, spherules, etc. were the result of extensive and intense forest fires initiated by the airbursts. Melting of the Laurentide Ice Sheet would have dumped copious quantities of melt water into the Atlantic, thereby disrupting the density currents and bringing on the cooling.
Over the years, however, support for the YDIH has been undermined. Nearly every aspect of the original evidence has been challenged by a host of scientists in various fields. Only one of the indicators, iridium, has been commonly used as an impact marker, and the iridium data have not always been reproducible. The iridium concentrations can also be explained by terrestrial origins.24, 25 Nor do nanodiamonds require extraterrestrial events. The absence of any impact craters at the beginning of the YD worldwide is the most disconcerting evidence against YDIH, as is the lack of control for the age of sediments/black mat at or near the YD boundary.
Elsewhere it remarks that even should air bursts be the case, from a massive comet breaking up or multiple comets breaking up, there still must be corresponding craters of the size of Meteor crater to correspond to the scale of the proposed devestation
In addition to these arguments against the YDIH, it is difficult to imagine how an airburst/impact could annihilate the North American mammal megafauna and Clovis culture and initiate huge wild fires, without leaving any evidence in the way of massive flooding or impact features. Vance Holliday and his colleagues argue that “no physical mechanism is known to produce an airburst that would affect the entire continent.”27 They also point out that any comet strike large enough to affect an entire continent would leave a detectable crater even if it struck the ice sheet. To get around this glaring problem, the Firestone group proposed that the comet broke up upon entry into earth’s atmosphere. But according to physicist Mark Boslough and his colleagues,28 that would produce “more than a million Meteor craters” (the size of the crater in central Arizona) based on the comet size postulated by Firestone and his cohorts.29, 30
While the Firestone group claims that the comet strike was responsible for the disappearance of the 37 mammal megafauna genera specifically in North America, extinctions occurred on other continents, most notably South America, where at least 52 mammal genera disappeared. And not all those genera disappeared synchronously at the YD boundary! Instead, megafauna extinctions on continents and islands seem to correlate with the arrival of humans. The thinking goes that these huge megafauna would have had no reason to fear humans, and were probably easy pickings for the newly arriving hunter-gatherers. Scientists have also been a bit incredulous that a comet strike could wipe out all the megafauna as far south as Patagonia, while leaving mammoths alive and well on St. Paul Island, Alaska until 3,700 years ago
(0) https://www.skeptic.com/reading_room/defant-analysis-of-hanc...
It is a circular argument that extinctions coincide with arrival of humans: that humans arrived at that time is an assumption, and one that is losing credibility. Anyway, as noted, you also need to explain why humans didn't wipe out African megafauna (no, wariness doesn't), and also why Clovis culture disappeared suddenly across the continent. One may doubt they starved immediately after wiping out the last of their prey.
You can quibble all you like about nanodiamond crystallography and carbon granules, but sharp platinum peaks at 200x above background, found at dozens of sites, need better explanation. It is curious--telling, even--that critics dwell on osmium isotope ratios and never mention platinum.
As was explained in connection with the K-T extinction event that attracted similar derision from geologists who had to retire before it got a fair hearing, anything that happened, can.
Similarly Marc Defant, former skeptic: https://www.marcdefant.com/2020/06/05/the-younger-dryas-impa...
Changing one's mind in the face of evidence is admirable and distressingly rare. Speaking up to admit having been wrong is oh-so-much rarer.
How advanced do you think this civilization was? Do you think it was the Clovis people?
I think the megafauna extinction as support for a catastrophic event is very poor. You see multiple waves of megafauna extinctions, each preceded by human introduction. Places without human presence had megafauna into the late 20th century. I'm not saying it didn't happen, but I'm saying it's unconvincing. And air bursts of that magnitude and coverage don't square with fossil or sediments.
But ... impacts aren't required for this. Maybe there was a culture that was relatively advanced. The Mississippian structures were huge. Incan and Mayan cultures were advanced based on contemporary cultures. Anyway, I'm curious what you believe is the case.
Except, the Inka, Mayan, Missouri and Amazon civilizations are 10+ millennia too late to be relevant, but in that they were unknown to Europeans until 500, 50, or 15 years ago.
I don't know anything about a pre-6000 BP civilization except that it is possible in principle, and evidence might be underwater. I would look first off the west coast of India, south of Pakistan and near old Harappan cities, where buildings are known of, under 60 ft of water. They snag fishermen's nets.
This article seems to combine the lost civilization pseudo-science of Randall Carlson and Graham Hancock with the myopia of catastrophic climate change alarmists that ignore paleoclimate evidence. This evidence is captured in the LR04 Benthic Stack data and is fully supported by ice core and other data sources.
Modelling the fluid dynamics following the termination of the last glacial maxima is non-trivial but the broad strokes are well understood. The 120 meter change in sea levels during the 100-kyr glacial cycles are associated with predictable ice sheets, post-glacial rebound, glacial lakes, and meltwater pulses. Something similar to Glacial Lake Missoula occurred after each termination.
What we should expect to see moving forward is the start of the re-accumulation of glacial ice timed to the Milankovich Cycles. The question is how big a monkey wrench does human forced atmospheric CO2 throw into the established cycles.
It is always too easy to think you must know what is relevant, after learning what seems like a lot.
The "nobody knows" claim applies no more to the LR04/MIS evidence than it does to tectonic plate evidence. This is well established science not an arena to practice Hayekian "fatal conceit" dismissals.
"We have excellent records of its reliable daily rise, going back centuries."
But sunrise is caused by rotation of a spheroid planet, in no way implied by those records.
It is very clear if you look at the area that this flood happened suddenly. Lots of exposed rimrock, the Rathdrum aquifer is massive and everything out here is riddled with glacial tumbled granite. Lake Pend Orielle is one of the deepest in the nation and at the North side is where the Clark fork "dam" was from the ice. When you look at the mountains where the river comes through they are fairly tall but there is a very noticeable "v" where the river comes through.[1] I would be more willing to believe something destabilized the mountain that was supporting the ice (earthquake? We do get them here).
Geologically this event happened not that long ago. Scars are clearly visible pretty much in all of the area if you look close. There is some discussion as well that there are stories of this event in various oral histories of the native people but I think it is still being studied.
Sidenote: Lake Pend Orielle was where Farragut naval base was...totally landlocked naval base where they still test sonar to this day. [2] Rumor has it they used to collapse subs in the lake due to how deep it was...but I am not sure how factual that is.
[1] http://hugefloods.com/Ice-Age-Floods-2.html Pic here labeled "Clark fork river" shows what I mean...but small picture [2] https://en.wikipedia.org/wiki/Farragut_Naval_Training_Statio...
Not while there’s so much political power to be had through climate change denial, which, I hope we start to treat with the same complete disgust and moral outrage as we treat Holocaust denial.
Additionally scientists should be looking at bandaids to extract carbon from the air or reflect sun back to space.
Malthusians who wish everyone just uses less power are both irrational and immoral. We should be trying to give every person on earth as much power as possible with the least damage to the environment. Modern society needs power.
I support rational and efficient energy policies, but our current system is bonkers! For example I got a 25% tax rebate replacing my skylight because it has a tiny solar-powered shade on it. The installer even joked to me that the $4k off the light was a scam! How is this helping the climate again?
The relatively meager environmental gains along the way are dwarfed by the larger environmental gain that start really compounding after 15-20 years of investment on this particular technological path and energy policy.
Modern society uses a lot of unnecessary energy in part because someone gets to make a lot of money now and leave this life before the consequences of unfettered destruction come due.
I say, we should have as much power as possible, generated as cleanly as possible, and the lowest possible cost. This is how we move society forwards.
Energy is the lifeblood of civilization. Reducing the cost of energy, and widespread availability of energy is responsible for saving perhaps a billion lives and bettering nearly 10 billion lives over the last century (that is to say, basically all of them).
The idea of putting a stranglehold on worldwide energy production or access is abhorrent when you look at the on-the-ground effects that such a policy would actually have on people’s lives. As you rightly point out, the most marginalized people worst of all.
Even if we could somehow stop industry from emitting even a gram of CO2 on 1/1/2021 going forward, the climate models still predict their 10 meter sea level rise just given the current greenhouse levels persisting.
The only answer is technological, and in my opinion it’s frankly not even going to be that complicated of a problem given the resources and technology available circa 2050 to deal with it.
Franky, solar shades seemed a lot harder of an ask pre-Starship. Looking forward to seeing SN8 reach for 60km in the near future.
Perhaps it's not going to cover 100% of things. But it's a thing you can be doing and it doesn't make things worse.
Meanwhile even with the relatively low usage of nuclear there are two regions of the world that used to be populated with people that now are abandoned.