Earlier quoted context omitted.
That was more than a billion years ago, so no.
I’ll take a risk and be skeptical of that claim and see how my life turns out.
Maybe consult the very first paragraph of the article you cited.
Ice core scientists in East Greenland reach bedrock
341–350 of 356 posts
Re: Ice core scientists in East Greenland reach bedrock
#342Earlier quoted context omitted.
There is definite evidence of hominins in North America 130,000 years ago (search "Cerutti mastodon"). Nobody knows if they were H. erectus , Neanderthal, Denisovan, modern humans, or "other", but with an interglacial at 125,000 years ago, it is not hard to see how they could have got here.
Wikipedia suggests this is not definitive, and maybe not even evidence: https://en.wikipedia.org/wiki/Cerutti_Mastodon_site#Criticis... This article is much more sympathetic (and also a fun read): https://www.latimes.com/local/california/la-me-cerutti-masto... I’m no expert but it seems like this is still a controversial idea.
Wikipedia over-represents the opinions of retired professors. As Max Planck wrote, "Science advances one funeral at a time".
The usual shallow, reflexive objection is that the bones must have been broken and carefully re-arranged via being run over by construction equipment. This absurd suggestion has been very thoroughly demolished without assistance from construction equipment. It is hard for dump truck tires to produce green-stick fractures in 130,000-year-old bone, or to put bone fragments into the pores of stones and then move them yards away, all while underground.
Re: Ice core scientists in East Greenland reach bedrock
#343Earlier quoted context omitted.
We have also pumped a very large amount of long-lived fluorine compounds into the air, that will last for centuries. They have from 2500x to 25000x times the "greenhouse gas warming potential", kg for kg. They are mostly refrigerants (CFCs, HFCs, and soon their successors) and transformer insulation gas (SF6). Volcanoes do emit some amount of fluorine compounds, too. We also have a great deal of methane leakage, whic…
I don't know about all compounds but CFCs stay in atmosphere for about a century only and we've already banned them, and methane has a very short lifetime of about 12 years. So we 'only' need to control emissions of those to solve the problem. On the other hand, as said, CO2 stays for centuries if not 1,000+ years so at this point net zero is only half the job though probably the hardest part.
HFCs are not banned yet. They are responsible for 2500x CO2 forcing. Your car is leaking those right at this moment.
Re: Ice core scientists in East Greenland reach bedrock
#344Earlier quoted context omitted.
A lot of modeling is moving toward Julia, so if you don't want to give money to Mathworks here are some alternatives: https://juliaclimate.github.io/Notebooks/
Note that the individual license for Matlab is $149/year [0], which isn't crazy IMHO. 0 - https://www.mathworks.com/pricing-licensing.html?prodcode=ML...
Sure, if you work alone, don't collaborate, and don't require any extra toolboxes.
I've seen various communities move from Matlab to Python, Octave, R, and Julia notebooks (that now support several languages). Ease of collaboration (including git repos and notebook interfaces), transparency of the platform (to tell what it's really doing), and ability to use computational resources.
I had a request from a grad student to run a simulation on a 40 node cluster. Said cluster cost $110k, including 40 nodes costing a bit over $2k each and some networking/storage. This would have reduced their embarrassingly parallel projects for their phd from 6-12 months to 5 to 9 days. Sadly the required matlab licenses would have cost more than $110k (the cost of teh hardware) because of the licenses and extra toolboxes. They cried. They had to delay their graduation and either reduce it's scope or rewrite it.
Re: Ice core scientists in East Greenland reach bedrock
#345Earlier quoted context omitted.
On the other hand if we only have 2-3 degrees of warming, if that’s enough to prevent the next ice age, didn’t we just dodge a massive icy bullet? Might we not one day thank ourselves for doing something reckless and stupid that actually worked out? Yeah a warmer climate brings all kinds of horrible changes. But food still grows in the northern hemisphere. A colder climate is arguably even worse for us. By the way, t…
What I gathered is that if the gulf stream stops, warm water will no longer flow north and the ice sheets will grow explosively, triggering an ice age (the kind where thick ice sheets flow southwards). That would pretty much wipe out anything built in the northern half of Europe... although granted, I don't know if it was like a kilometer high ice sheet rolling our way or how fast it went in previous ice ages, it mig…
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Re: Ice core scientists in East Greenland reach bedrock
#346This is a very important project. There is a joke in here about "why not wait 2 years for the ice to melt off if you wanted to look at the mud underneath?" But as the article states, "'This will change climate models because it redefines our basic understanding of how ice moves,' explains Dorthe Dahl-Jensen." Much, if not the majority, of climate science is the creation of models (differential equations mostly) that…
You're adding important context but I would like to clarify something to highlight just how complex climate change really is. I also am going to make a few related comments, as I do most of my research on melt in Greenland. Full disclosure: I do know some of the people in this article but I have never been to eGRIP specifically. I will be in Greenland in a week nearby though. No matter what the far future holds, the…
> If you were inclined to believe the covid lab leak theory you would also be inclined to jump on this and say "then the extreme storms are nonsense".
What does the "COVID lab leak theory" and the "belief" in it have to do with this? conflating these two does only one thing, it further polarises and politicises the already heavily polarised and politicised debate around (anthropogenic) "climate change". It is already nearly impossible to have an objective discussion on this subject without conflating it with other similarly polarised subjects so adding this trip wire does not improve things, at all.
Re: Ice core scientists in East Greenland reach bedrock
#347Earlier quoted context omitted.
Good finds. Thanks! Yeah, it's the comparison between DRE and Gas ejecta that got me bogged down before. Having now given up, I asked ChatG4. It says "the mass ratio between DRE and gaseous emissions might be on the order of 20:1 to 100:1", no citations ofc. So, just as a strawman and using your 10-40%, on the low end .01 .1 = 0.001, high end .05 .4 = 0.02. So .1%-2% of ejecta by mass is CO2 emissions. Hah :) Using m…
DRE == dense rock equivalent: https://en.wikipedia.org/wiki/Dense-rock_equivalent >
Math glitch. It was a million gigatons DRE, so 1000 Gt CO2
Re: Ice core scientists in East Greenland reach bedrock
#348Earlier quoted context omitted.
I’ll take a risk and be skeptical of that claim and see how my life turns out.
Maybe consult the very first paragraph of the article you cited.
I read it but I didn't take it as proof. A team of people when faced with a mystery and the came up with an answer.
They is not the same as proof in my book. I also did poorly in school. I'm not good at taking this as stated. I enjoy wallowing in the unknown rather than believe everything I'm told to me own detriment.
Re: Ice core scientists in East Greenland reach bedrock
#349Earlier quoted context omitted.
On the other hand there’s something to be said for a comfortable climate that leaves people with time to think when the everyday isn’t a constant complex struggle. The Inuits of Greenland and Sami people of Lapland didn’t have Aristotle or Confucius.
That we know of; did they have a system of writing? I find it hard to believe they wouldn't philosophise at all. Confucius got famous (like sun tzu et al) because his ideas were written down, published and spread.
The number of different words they have for snow and ice demonstrates a cultural understand of distinct attributes of objects. I think this would be the first step of consciousness understand one thing as distinct and separate from another.
Re: Ice core scientists in East Greenland reach bedrock
#350Earlier quoted context omitted.
Maybe consult the very first paragraph of the article you cited.
I read it but I didn't take it as proof. A team of people when faced with a mystery and the came up with an answer. They is not the same as proof in my book. I also did poorly in school. I'm not good at taking this as stated. I enjoy wallowing in the unknown rather than believe everything I'm told to me own detriment.
A wikipedia article does not pretend to be proof. It is a summary. For proof you would need to look at the, y'know, evidence. The decay rates of the isotopes involved are known exactly. It is hard to find anything more certain than timelines revealed by radioactive decay.