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Environmental News

Discussion in 'Environmental Discussion' started by tochatihu, Oct 22, 2015.

  1. fuzzy1

    fuzzy1 Senior Member

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    That faulty PM article is accompanied by "Related Stories" links, one of which describes some of this:
    Earth Has a Secret Hidden Layer: What's in Earth's Inner Core?

    I can't vouch for total accuracy, but the multi-layer core model, solid inner and liquid outer layers, is the current understanding. They cannot keep spinning in opposite directions, the mechanical and viscous friction would probably release enough heat to keep the whole planet molten, until friction forces everything to settle to the same direction, or nearly so. Conservation of angular momentum would mean that the settled spin rate of the end result would be less than the initial spin rates of the counter-rotating parts. But astronomically speaking, I haven't heard of any concepts of planet formation that could create initially counter-rotating parts. Colliding galaxies and gaseous stars are a different matter, and the results will not be "gentle".

    I have heard a hypotheses that the core and crust do spin at different rates, but the suggested difference is tiny, as in a few degrees of rotation difference per century. No followup noticed.
     
    #1281 fuzzy1, Mar 19, 2021
    Last edited: Mar 19, 2021
  2. vvillovv

    vvillovv Senior Member

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  3. tochatihu

    tochatihu Senior Member

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    @fuzzy1 #1281, I don't find anything indicating rotations in opposite directions 'down there'.

    Seismic signals propagate at different speeds in different directions. I cannot infer rotation rate from that.
     
  4. tochatihu

    tochatihu Senior Member

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  5. tochatihu

    tochatihu Senior Member

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    "Conference of the Parties" 15 Biodiversity meeting date has been pushed back again.

    New 2021 dates announced for UN Biodiversity Convention meetings -- 11-24 October 2021

    (which some in sleepy Kunming have expected for a long time, but don't tell)

    Posters and banners went up all over town a month or so ago, but did not mention the previous 2021 May schedule.

    When it finally does happen, will be quite a shindig*.

    *archaic
     
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  6. Merkey

    Merkey Active Member

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    "Party on Garth". Also archaic.
     
  7. vvillovv

    vvillovv Senior Member

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    At the HOP **

    wishful thinking for some. Not expecting much to change afterwards, at least not in this world. :censored:
     
  8. fuzzy1

    fuzzy1 Senior Member

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    The internal heat flowing up to Earth's surface is on the order of 0.1 w/m^2. I'm having great difficultly imagining any sort of bearing between counter-rotating planet parts that could be sufficiently low friction to produce heat rates anywhere near that low. Or even low enough to not be burning the soles of our feet.

    As for the core and crust possibly having different spin rates, I'm finding the claims to be sufficiently varied and sparse that all could be considered outliers. This one suggests the core spinning about 1°/year faster than the crust, but others suggest differences on the order of 0.1° to 0.000001°/year.
     
    #1288 fuzzy1, Mar 22, 2021
    Last edited: Mar 22, 2021
  9. tochatihu

    tochatihu Senior Member

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    Nobel Prize Summit on Biodiversity, April 26–28, 2021 may provide a preview of COP15. I understand that livestreaming will be free.

    Meanwhile to get an idea how biodiv people think, one could download a free article from Ambio

    https://doi.org/10.1007/s13280-021-01544-8

    There is at present a lot of biodiversity funding rattling around. It could be considered disorganized and difficult to assess success. Maybe disorganized is OK - I couldn't say, really.
     
  10. tochatihu

    tochatihu Senior Member

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  11. Salamander_King

    Salamander_King Senior Member

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    This might have been mentioned in this thread or elsewhere.

    On one hand, a recent NYT article celebrating the recovery of the bald eagle population in the US from a blink of extinction by very strong conservation efforts. And on the recent issue of the Science cover article, the scientists finally discovered the cause of a devastating disease attacking the bald eagle population in the last 20+ years.

    Original Science paper here: Hunting the eagle killer: A cyanobacterial neurotoxin causes vacuolar myelinopathy | Science

    The articles were very timely for us having seen a pair of resident bald eagles looking for a nesting site in our back yard. Yeah, the photo below was taken in my backyard from the deck using a normal lens. We have seen a pair of birds within 10-20 feet of our house. It would be very exciting tenants to have on our property, but their presence would make it impossible to keep our flock of chickens and ducks free-ranging. Hmmm, any idea someone?

    upload_2021-3-28_20-25-10.png
     
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  12. tochatihu

    tochatihu Senior Member

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    Switch to turkeys, they are harder to lift.
     
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  13. Salamander_King

    Salamander_King Senior Member

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    Yeah, that's true. But we already have plenty of wild turkeys roaming around on our property.
    upload_2021-3-28_21-8-37.png
     
  14. ChapmanF

    ChapmanF Senior Member

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    Well, they didn't get so plentiful by being easy to lift.
     
  15. tochatihu

    tochatihu Senior Member

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    There is a grim chicken story, probably familiar to many here. The two commercial fleets are known as 'broilers' and 'layers'. Those born male in the latter fleet are culled early and not in a pretty way.

    Some genetic engineering company (Israeli I think) has figured out how to make layers send only female eggs down the chute. That should be very helpful.

    But yes, chickens are what we call 'r-selected' and neither eagles nor not-pretty grinders can hold them back.
     
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  16. Salamander_King

    Salamander_King Senior Member

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    Our chickens are neither broilers nor layers. They are considered to be dual-purpose breeds. Plymouth Rock, Rhode Island Red, Orpington, Austalorp, Wyandotte to name a few. But we only have females, although we also have ornamental bantam silkies that we got chicks as straight run and ended up with both roosters and hens.

    upload_2021-3-28_22-19-45.png
     
  17. t_newt

    t_newt Active Member

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    A more recent study:

    Greenland and Antarctica are gaining ice inland, but still losing it overall.
     
  18. tochatihu

    tochatihu Senior Member

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  19. tochatihu

    tochatihu Senior Member

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  20. tochatihu

    tochatihu Senior Member

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