• úvod
  • témata
  • události
  • tržiště
  • diskuze
  • nástěnka
  • přihlásit
    registrace
    ztracené heslo?
    TUHOKlimaticka zmena / Thank you so much for ruining my day
    TADEAS
    TADEAS --- ---
    jak se pase 5000 hlavy stado, check it out ,)

    herd impact
    https://youtube.com/watch?v=EBTINtTcBbE&feature=share
    TADEAS
    TADEAS --- ---
    TADEAS: ad ohen

    James C Scott: The Domestication of Fire, Animals, Grains and.......Us
    http://www.youtube.com/watch?v=oQgQRmx19HA
    TADEAS
    TADEAS --- ---
    longread s hezkou infografikou


    In the Atlantic Ocean, Subtle Shifts Hint at Dramatic Dangers
    https://www.nytimes.com/interactive/2021/03/02/climate/atlantic-ocean-climate-change.html


    a spate of studies, including one published last week, suggests this northern portion of the Gulf Stream and the deep ocean currents it’s connected to may be slowing. Pushing the bounds of oceanography, scientists have slung necklace-like sensor arrays across the Atlantic to better understand the complex network of currents that the Gulf Stream belongs to, not only at the surface, but hundreds of feet deep.

    “We’re all wishing it’s not true,” Peter de Menocal, a paleoceanographer and president and director of the Woods Hole Oceanographic Institution, said of the changing ocean currents. “Because if that happens, it’s just a monstrous change.”

    The consequences could include faster sea level rise along parts of the Eastern United States and parts of Europe, stronger hurricanes barreling into the Southeastern United States, and perhaps most ominously, reduced rainfall across the Sahel, a semi-arid swath of land running the width of Africa that is already a geopolitical tinderbox.

    ...

    The scientists’ concern stems from their understanding of thousands of years of the prehistoric climate record. In the past, a great weakening or even shutdown of this arm of the Gulf Stream seems to have triggered rapid changes in temperatures and precipitation patterns around the North Atlantic and beyond.

    The northern arm of the Gulf Stream is but one tentacle of a larger, ocean-spanning tangle of currents called the Atlantic Meridional Overturning Circulation, or AMOC. Scientists have strong evidence from ice and sediment cores that the AMOC has weakened and shut down before in the past 13,000 years. As a result, mean temperatures in parts of Europe may have rapidly dropped to about 15 degrees Celsius below today’s averages, ushering in arctic like conditions. Parts of northern Africa and northern South America became much drier. Rainfall may even have declined as far away as what is now China. And some of these changes may have occurred in a matter of decades, maybe less.

    ...

    The science remains relatively new, and not everyone agrees the AMOC is actually slowing. But in both scientific modeling of climate change and in the prehistoric record, a North Atlantic cooling presages a shutdown of the current. “One of the hallmarks of a shutdown is this cold blob,” says Dr. de Menocal. “The cold blob is a big deal.”

    ...

    The clearest example began about 12,800 years ago. Glaciers that had once covered much of North America and Europe had retreated considerably, and the world was almost out of the deep freeze. But then, in just a few decades, Greenland and Western Europe plunged back into cold. Temperatures fell by around 10 degrees Celsius, or 18 degrees Fahrenheit, in parts of Greenland. Arctic-like conditions returned to parts of Europe.

    The cold snap lasted perhaps 1,300 years — before reversing even more abruptly than it began. Scientists have observed the sudden changes in the pollen deposited at the bottom of European lakes and in changes in ocean sediments near Bermuda.

    This forced a paradigm shift in how scientists thought about climate change. Earlier, they had tended to imagine creeping shifts occurring over many millennia. But by the late 1990s, they accepted that abrupt transitions, tipping points, could occur.

    This didn’t bode well for humanity’s warming of the atmosphere. Dr. Broecker, who died in 2019, famously warned: “The climate system is an angry beast and we are poking it with sticks.”

    ...

    WHY DID THE AMOC shut down? A leading theory is that meltwater from retreating glaciers emptied into the North Atlantic or Arctic oceans. Freshwater is lighter than saltwater, and the sudden influx of more buoyant water could have impeded the sinking of denser, saltier water — that critical “overturning” phase of the AMOC.

    Today we don’t have massive glacial lakes threatening to disgorge into the North Atlantic. But we do have the Greenland ice sheet, which is melting at the upper end of projections, or about six times faster than in the 1990s. And according to one study, the subpolar North Atlantic recently became less salty than at any time in the past 120 years.

    There’s little agreement on cause. Changes in wind patterns or currents may be contributing, as could greater rainfall. But Stefan Rahmstorf, a physical oceanographer with the University of Potsdam in Germany, suspects that, similar to what happened some 12,800 years ago, meltwater from Greenland is beginning to slow the AMOC.
    SHEFIK
    SHEFIK --- ---
    Tenfold increase in CO2 emissions cuts needed to stem climate emergency -- ScienceDaily
    https://www.sciencedaily.com/releases/2021/03/210303142601.htm

    New research shows 64 countries cut their fossil CO2 emissions during 2016-2019, but the rate of reduction needs to increase tenfold to meet the Paris Agreement aims to tackle climate change.
    SHEFIK
    SHEFIK --- ---
    linky na zajmavy studie uvnitr

    Novinky o klimatu: Gates má návod na snížení emisí. Vím, jak je dostat na nulu, tvrdí
    https://zpravy.aktualne.cz/...0cc47ab5f122/?utm_source=mediafed&utm_medium=rss&utm_campaign=mediafed
    SEJDA
    SEJDA --- ---
    SHEFIK: jop, jakekoli vyuziti odpadnich energii je super, viz. spalovny odpadu.
    SHEFIK
    SHEFIK --- ---
    JIMIQ: kdybych chtel rejpat, zeptal bych se, jestli tezba bitcoinu nepotrebuje taky infrastrukturu. taky bych se moh zeptat na srovnani pridane hodnoty jednotlivych reseni z pohledu lidstva/klimatu/jednotlivce

    ale rejpat nebudu :)
    JIMIQ
    JIMIQ --- ---
    SHEFIK: z toho není tak rychlej zisk bez další infrastruktury :)
    SHEFIK
    SHEFIK --- ---
    JIMIQ: v hlavni roli bitcoin "vysvoboditel" :))

    selsky rozum mi rika, ze kdyz je mozny z odpadniho plynu tezit bitcoin, je taky mozny tu energii treba konvertovat na vodik atd.
    JIMIQ
    JIMIQ --- ---
    Bitcoin jako požírač energie. Ale co když je to naopak? - Seznam Zprávy
    https://www.seznamzpravy.cz/clanek/bitcoin-jako-pozirac-energie-ale-co-kdyz-je-to-naopak-145138

    Odpadní plyn jako vedlejší produkt těžby ropy je uvázlá, nepoužitelná energie, generující jen náklady a spaliny.

    Tedy byla to nepoužitelná energie, dokud firma Crusoe nezačala dodávat mobilní kontejnery obsahující turbínu, generátor a datové centrum. Tato sestava umí ukončit bezúčelné a neekologické pálení plynu a vysvobozenou energií zásobovat těžbu bitcoinů, financující celou hru. Marty Bent z firmy GAM odhaduje, že jedna instalace za jeden měsíc spotřebuje a zaplatí plyn asi za $475k. Plyn, který by jinak přišel nazmar. Ročně se na světě bez užitku spálí asi 150 miliard m3 plynu, což by Česku stačilo skoro na 20 let.

    Těžba bitcoinů nabízí cestu, jak monetizovat nepřenositelnou energii, ať je, kde je. Nic takového dosud nebylo možné a profit je skvělá motivace.
    SEJDA
    SEJDA --- ---
    TADEAS: no jo, tedka radova chybka ;)
    TADEAS
    TADEAS --- ---
    SEJDA: sice nejsme v klubu poctaru, ale 50 ha je pul km ctverecniho, tj. kilak x 500 m... to co uvadis je desetina.
    SEJDA
    SEJDA --- ---
    RADIQAL: 50ha = je 220x220m.
    No taky to tam uz nevidim, bylo to tam dole v pravo ;) Takze jsem bud halucinoval, nebo to upravili.
    RADIQAL
    RADIQAL --- ---
    RADIQAL: 50 ha = cca 70 fotbalovych hrist.
    RADIQAL
    RADIQAL --- ---
    SEJDA: sry ale taky jsem z toho linku nikde nevycet, ze prave na tomhle obrazku by melo byt 50ha. co presne jsi tim chtel ilustrovat?
    PER2
    PER2 --- ---
    a k vasi diskusi o vodiku v australii:

    ---jeden z projektu(je jich nekolik v tyhle oblasti) - The Asian Renewable Energy Hub - 2028:
    The proposed project includes:
    26 GW of wind and solar generation
    At least 3 GW of generation capacity for Pilbara energy users
    Up to 23 GW of generation for production of green hydrogen and green ammonia
    Up to 100 TWh of total annual generation
    A design life of 50+ years

    From a 14,000-square kilometre initial land package, 6,500 square kilometres of land in the East Pilbara region of Western Australia were selected to accommodate 26,000 MW of wind turbines and solar photovoltaic panels. Outstanding wind and solar resource and large project scale will result in competitively priced renewable energy with a high capacity factor.


    ---dalsi projekt (The Arrowsmith Hydrogen Project) ten by mel byt v provozu koncem 2022
    The plant would be supplied by around 85 megawatts of solar power, supplemented by 75 megawatts of wind generation capacity, which will be generated on-site. The project would also integrate a large-scale battery on-site.

    Green Hydrogen Sub-commercial Plant #1
    Stage One of the IBE Liquid Hydrogen Project will be the Arrowsmith Project, located in Western Australia. This installation will commence production in 2022 resulting in 25 tons (25,000 kg) of green Hydrogen per day from the zero carbon energy sources of water, solar and wind.

    Green Hydrogen Commercial Plant #2
    (Capacity 75,000Kg/day)



    obrazek patri k AREH

    PER2
    PER2 --- ---
    SEJDA: "Kdyby se vam zle predstavovalo, co je to 50ha, tak je to asi tolik"

    uhm, tohle ze je 700x700m?

    v clanku:
    "Floating solar installations at the dam, which will resemble those in this image"
    "“The [floating PV] project will occupy a total area of about 50 hectares of water surface and will require over 127,000 PV panels "
    SEJDA
    SEJDA --- ---
    DZODZO: no prece, ze elektrolyzovat muzou i arabove, takze proc by to melo byt vsechno v australii? :)
    DZODZO
    DZODZO --- ---
    SEJDA: takze pri zapocitani vsetkych tych naddimenzovani mi to vychadza 1km2 plochy na 1 lod, takze budes potrebovat flicek velkosti 55000km2, ale stale neviem ci je to teda jako malo alebo jako moc, neviem co tym sledujes
    THEODORT
    THEODORT --- ---
    SEJDA: kurva elegantni reseni jak udrzet v rezervoaru pitnou vodu
    Kliknutím sem můžete změnit nastavení reklam