That should read northern white rhino. (edit - as noted by GY!)
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The Sixth Extinction (Environmental News)
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Very interesting piece from the Atlantic about the Fifth Extinction
While the majority of her peers embraced the Chicxulub asteroid as the cause of the extinction, Keller remained a maligned and, until recently, lonely voice contesting it. She argues that the mass extinction was caused not by a wrong-place-wrong-time asteroid collision but by a series of colossal volcanic eruptions in a part of western India known as the Deccan Traps—a theory that was first proposed in 1978 and then abandoned by all but a small number of scientists. Her research, undertaken with specialists around the world and featured in leading scientific journals, has forced other scientists to take a second look at their data. “Gerta uncovered many things through the years that just don’t sit with the nice, simple impact story that Alvarez put together,” Andrew Kerr, a geochemist at Cardiff University, told me. “She’s made people think about a previously near-uniformly accepted model.”
Keller’s resistance has put her at the core of one of the most rancorous and longest-running controversies in science. “It’s like the Thirty Years’ War,” says Kirk Johnson, the director of the Smithsonian’s National Museum of Natural History. Impacters’ case-closed confidence belies decades of vicious infighting, with the two sides trading accusations of slander, sabotage, threats, discrimination, spurious data, and attempts to torpedo careers. “I’ve never come across anything that’s been so acrimonious,” Kerr says. “I’m almost speechless because of it.” Keller keeps a running list of insults that other scientists have hurled at her, either behind her back or to her face. She says she’s been called a “bitch” and “the most dangerous woman in the world,” who “should be stoned and burned at the stake.”
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I'm going to get stuck into that article later. The Chicxulub theory has always felt - at best - incomplete to me. That even if the impact was a trigger, it should have been insufficient on its own, that there has to be a whole lot more going on. This is, of course, based on little real data and not much reading - I feel properly in the company of climate change deniers on this subject - but it just doesn't quite ring true.
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A part of how these big name scientists get money is by creating two competing theories to explain something and then securing funding by promising to prove that one of the two theories is correct. A fake controversy, in other words.
The K/T meteroite was a fuck off huge meteroite and it probably could have made the dinosaurs extinct all by itself. However, it is possible that the dinos were on their last lags anyway due to the volcanic activity. So the impact may have got them at a vulnerable time. Will we ever know if the impact alone could have done it? No. But that's not something worth getting angry about.
My geology lecturer in Amsterdam was one of the guys who discovered the impact crater and if you asked him a question about the Deccan Traps theory he'd lose his head altogether.Last edited by anton pulisov; 20-10-2018, 21:32.
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60% of all animals since 1970. That's since 1970, not since 5000 BC or something, that's in my lifetime. 60%. Wiped out. I can't even. There are an increasing number of days, and weeks, when I get more and more convinced that the end of humanity would be a positive step
https://www.theguardian.com/environm...r-report-finds
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- Mar 2008
- 20965
- The House with the Golden Windows
- Fast falling out of love for football.
- WasPlain Hobnobs
Originally posted by anton pulisov View PostA part of how these big name scientists get money is by creating two competing theories to explain something and then securing funding by promising to prove that one of the two theories is correct. A fake controversy, in other words.
The K/T meteroite was a fuck off huge meteroite and it probably could have made the dinosaurs extinct all by itself. However, it is possible that the dinos were on their last lags anyway due to the volcanic activity. So the impact may have got them at a vulnerable time. Will we ever know if the impact alone could have done it? No. But that's not something worth getting angry about.
My geology lecturer in Amsterdam was one of the guys who discovered the impact crater and if you asked him a question about the Deccan Traps theory he'd lose his head altogether.
Isn't "theory 'C'" that as a result of the Earth lensing the shock wave of the impact, the Deccan Traps erupted at the same time.
(Or has that been completely debunked?)
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The Chicxulub theory has always felt - at best - incomplete to me. That even if the impact was a trigger, it should have been insufficient on its own, that there has to be a whole lot more going on.
When in reality the people talking about this are talking in geological time. so the impact causes a "nuclear winter" and huge volcanic activity which dims the sun and acidifies the oceans and the water cycle, which lowers the surface temp and kills foliage which means megafauna find the going getting harder, which slowly collapses the food chain, which means that smaller animals (small raptors, small mammals, small winged dinos) start outcompeting them etc. etc and over a few hundred thousand years giant dinosaurs as we know them just sort of fade away. Which to the fossil record looks like a hard stop, given the unimaginably huge amounts of time that they were around. So the scientists say wiped out, meaning over a million or so years and our brains hear wiped out and process that as an immediate thing. Which it both is and isn't depending on your viewpoint.
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Originally posted by Guy Profumo View PostIsn't "theory 'C'" that as a result of the Earth lensing the shock wave of the impact, the Deccan Traps erupted at the same time.
(Or has that been completely debunked?)
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Yes, there is a really fantastic recent paper about this stuff, which you can read because it is in one of the open access journals.
I like this paper because it is written by two youngish scientists who just used a standard PC and some basic programming skills to look at publicly available satellite data about the sea floor. They concluded that (1) the sea floor put down during the impact period (around 65 million years ago) is thicker, suggesting that there was a lot of volcanic activity going on and (2) when you reconstruct where the thickest parts of the sea floor were 65 million years ago, it was roughly at the opposite side of the Earth from the impact.
Like I said, these guys just used a PC and some freely available data and managed to scoop big scientists with their big ships, coring rigs and fancy mass spectrometers. Love it.
It brings everything together nicely, but the big scientists still need an impact vs Decan Traps controversy to get their money...
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The pictures and video from the Climate Strike demonstrations across the world are giving me some hope on a rather dark day.
https://twitter.com/GretaThunberg/status/1106439309605986305
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Yes, vitally needed optimism-inducing stuff.
Meanwhile, at the risk of seeming parochial and partisan, was struck by the absentee in this:
The Conservative party was invited to participate, but declined.Today, youth climate strikers are demanding action on climate change. Our panel of politicians answer the activists
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Another addition to the crimes of David Cameron
[URL]https://twitter.com/crisortunity/status/1137746106396434432?s=21[/URL]
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Originally posted by Nefertiti2 View PostAnother addition to the crimes of David Cameron
[URL]https://twitter.com/crisortunity/status/1137746106396434432?s=21[/URL]
The geographical PV CO2 breakeven line in Europe is probably somewhere below the Pyrenees, in America it's close to the Mason-Dixon Line (but juts up in sunnier drier western regions like Nevada or Idaho).Last edited by linus; 13-06-2019, 18:31.
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Originally posted by laverte View PostExperts disagree with you.
I am actually in this line of business, in real estate development. In the opinion of experts I've talked to, PV solar is, at my latitude/location, not carbon neutral. It's not cost-effective either, the best approaches from an energy conservation standpoint is passive solar, geothermal (for houses over 200m2 in continental weather like ours) and solar water heaters in that order. PV panels aren't cost-effective in my region, which gets nearly twice the solar energy as the average UK location, as well they only reach carbon neutrality further south in the US or in drier sunnier climates out west like the Okanagan Valley.
https://i.imgur.com/vYpbh.png
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I actually strongly disagree about the impact of CO2 on climate, because of the logarithmic relationship between CO2 density and its greenhouse effect. At the current concentration of 400ppm, the impact from additional CO2 is marginal, water vapor monopolizes the overall greenhouse effect. As well we do know that the increase in CO2 over the last several decades has had a tremendously positive impact on agriculture and plant cover worldwide, particularly in arid areas like the African Sahel or northwestern India, because the CO2 fertilizing effect is more powerful in drier climates:
http://www.globalwarming-sowhat.com/...ie_med_hr.jpeg
https://www.nasa.gov/feature/goddard...greening-earth
I need to know about the PV panels CO2 footprint because the subject comes up with my clients, and it's their decision to make. Some will seek Platinum-LEED level packages, which will often include PV panels, but the last leg or the upgrade from silver or gold LEED levels is pretty expensive for marginal levels of conservation gain. The least practical and most overzealous clients will buy water collection systems, designed for arid climates, in one of the world's most hydrologically abundant areas...Last edited by linus; 14-06-2019, 19:56.
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