Podnebni ekstremizem

kow je 15. jun 2023 ob 08:51 izjavil:

Predlagam, da mi kar ti poisces podatke. Najdi mi podatke, ki kazejo, da se zemlja ohlaja. Hvala!

kow je 15. jun 2023 ob 09:15 izjavil:

Dobro ves, da me zanima obdobje mojega zivljenja (rojen sem bil v 80ih), pa recimo, da bom zivel se 40 let. Zemlja se segreva, se strinjas vsaj v tem ali bos zopet saltal na dinozavre?

Our 4.54-billion-year-old planet probably experienced its hottest temperatures in its earliest days, when it was still colliding with other rocky debris (planetesimals) careening around the solar system. The heat of these collisions would have kept Earth molten, with top-of-the-atmosphere temperatures upward of 3,600° Fahrenheit.

Even after those first scorching millennia, however, the planet has often been much warmer than it is now. One of the warmest times was during the geologic period known as the Neoproterozoic, between 600 and 800 million years ago. Conditions were also frequently sweltering between 500 million and 250 million years ago. And within the last 100 million years, two major heat spikes occurred: the Cretaceous Hot Greenhouse (about 92 million years ago), and the Paleocene-Eocene Thermal Maximum (about 56 million years ago).

A Smithsonian Institution project has tried to reconstruct temperatures for the Phanerozoic Eon, or roughly the last half a billion years. Preliminary results released in 2019 showed warm temperatures dominating most of that time, with global temperatures repeatedly rising above 80°F and even 90°F--much too warm for ice sheets or perennial sea ice. About 250 million years ago, around the equator of the supercontinent Pangea, it was even too hot for peat swamps!

Geologists and paleontologists have found that, in the last 100 million years, global temperatures have peaked twice. One spike was the Cretaceous Hot Greenhouse roughly 92 million years ago, about 25 million years before Earth's last dinosaurs went extinct. Widespread volcanic activity may have boosted atmospheric carbon dioxide. Temperatures were so high that champsosaurs (crocodile-like reptiles) lived as far north as the Canadian Arctic, and warm-temperature forests thrived near the South Pole.

Another hothouse period was the Paleocene-Eocene Thermal Maximum (PETM) about 55-56 million years ago. Though not quite as hot as the Cretaceous hothouse, the PETM brought rapidly rising temperatures. During much of the Paleocene and early Eocene, the poles were free of ice caps, and palm trees and crocodiles lived above the Arctic Circle.

During the PETM, the global mean temperature appears to have risen by as much as 5-8°C (9-14°F) to an average temperature as high as 73°F. (Again, today's global average is shy of 60°F.) At roughly the same time, paleoclimate data like fossilized phytoplankton and ocean sediments record a massive release of carbon dioxide into the atmosphere, at least doubling or possibly even quadrupling the background concentrations.

Earth's hottest periods--the Hadean, the late Neoproterozoic, the Cretaceous Hot Greenhouse, the PETM--occurred before humans existed. Those ancient climates would have been like nothing our species has ever seen.

Modern human civilization, with its permanent agriculture and settlements, has developed over just the past 10,000 years or so. The period has generally been one of low temperatures and relative global (if not regional) climate stability. Compared to most of Earth's history, today is unusually cold; we now live in what geologists call an interglacial--a period between glaciations of an ice age.

kow je 15. jun 2023 ob 09:41 izjavil:

Jaz nisem nikjer omenjal rekordnih temperatur. Zmeni se s CoolBits, on pravi, da se hladi oz. je temperatura staticna.

kow je 15. jun 2023 ob 08:51 izjavil:

Predlagam, da mi kar ti poisces podatke. Najdi mi podatke, ki kazejo, da se zemlja ohlaja. Hvala!

Mato989 je 15. jun 2023 ob 06:38 izjavil:

Saj lahko oporekaš, ampak moraš imeti argument, dokaz, zaradi katerega oporekaš, če nimaš, potem oporekaš iz nekega čustvenega vzgiba - in ravno znanost je tisto orodje, ki čustvene vzgibe filtrira, da dobimo objektivno resnico.

Bilo je podanih več kot dovolj povezav do študij, grafov, itn.

Torej me pšreusmeri na raziskavo kjer obrazloži zakaj je v času JURE (obdobje) bilo več CO2 in več Kisika v ozračju in je rastje bujno uspevalo, živalstvo tudi... in kako je bil za tisti porast co2 kriv človek?

Multiple lines of evidence unequivocally establish the dominant
role of human activities in the growth of atmospheric CO2. First, the
systematic increase in the difference between the MLO and SPO
records (Figure 5.6a) is caused primarily by the increase in emissions
from fossil fuel combustion in industrialized regions that are situated
predominantly in the Northern Hemisphere (Ciais et al., 2019). Second,
measurements of the stable carbon isotope in the atmosphere (d13C–
CO2) are more negative over time because CO2 from fossil fuels
extracted from geological storage is depleted in 13C (Figure 5.6c;
Rubino et al., 2013; Keeling et al., 2017). Third, measurements of the
d(O2/N2) ratio show a declining trend because for every molecule of
carbon burned, 1.17 to 1.98 molecules of oxygen (O2) is consumed
(Figure 5.6d; Ishidoya et al., 2012; Keeling and Manning, 2014). These
three lines of evidence confirm unambiguously that the atmospheric
increase of CO2 is due to an oxidative process (i.e., combustion).
Fourth, measurements of radiocarbon (14C–CO2) at sites around the
world (Levin et al., 2010; Graven et al., 2017; Turnbull et al., 2017)
show a continued long-term decrease in the 14C/12C ratio. Fossil fuels
are devoid of 14C and therefore fossil fuel-derived CO2 additions
decrease the atmospheric 14C/12C ratio (Suess, 1955).

The evolution of Earth’s climate on geological timescales is largely driven by variations in the
magnitude of total solar irradiance (TSI) and changes in the greenhouse gas content of the
atmosphere. Here we show that the slow B50 Wm¯²increase in TSI over the last B420
million years (an increase of B9 Wm¯² of radiative forcing) was almost completely negated
by a long-term decline in atmospheric CO2. This was likely due to the silicate weathering-
negative feedback and the expansion of land plants that together ensured Earth’s long-term
habitability. Humanity’s fossil-fuel use, if unabated, risks taking us, by the middle of the
twenty-first century, to values of CO2 not seen since the early Eocene (50 million years ago).
If CO2 continues to rise further into the twenty-third century, then the associated large
increase in radiative forcing, and how the Earth system would respond, would likely be
without geological precedent in the last half a billion years.

Although rates of change in the Anthropocene are necessarily assessed over much shorter periods than those used to calculate long-term baseline rates of change, and therefore present challenges for direct comparison, they are nevertheless striking. The rise in global CO2 concentration since 2000 is about 20 ppm per decade, which is up to 210 times faster than any sustained rise in CO2 during the past 800,000 years (Lüthi et al., 2008; Bereiter et al., 2015). AR5 found that the last geological epoch with similar atmospheric CO2 concentration was the Pliocene, 3.3 to 3.0 Ma (Masson-Delmotte et al., 2013). Since 1970 the global average temperature has been rising at a rate of 1.7°C per century, compared to a long-term decline over the past 7,000 years at a baseline rate of 0.01°C per century (NOAA, 2016; Marcott et al., 2013). These global-level rates of human-driven change far exceed the rates of change driven by geophysical or biosphere forces that have altered the Earth System trajectory in the past (e.g., Summerhayes 2015; Foster et al., 2017); even abrupt geophysical events do not approach current rates of human-driven change.

Mato989 je 15. jun 2023 ob 10:03 izjavil:

Torej kdo je kriv če izbruhne Yellowstone in se v luft spusti več CO2 kot ga je človeštvo sproduciralo v ŽNJ stoletjih verjetno? Smo krivi ljudje? Nihče ne more proizvest toliko CO2ja kot Zemlja/narava sama...

Sploh pa kako boste obrazložili problematičnost CO2ja če imamo dokazano da je v ozračju bilo VEČ CO2 v obdobjih ko ljudi ni bilo in je hkrati rastje bistveno bolj uspevalo ker je imelo več kisika za "dihat"

Volcanic eruptions are often discussed in relation to climate change because they release CO2 (and other gases) into our atmosphere. However, human contributions to the carbon cycle are more than 100 times those from all the volcanoes in the world - combined.

In comparison, while volcanic eruptions do cause an increase in atmospheric CO2, human activities emit a Mount St. Helens-sized eruption of CO2 every 2.5 hours and a Mount Pinatubo-sized eruption of CO2 twice daily.

The largest possible eruptions come from super volcanoes like Yellowstone or Mount Toba (which erupt very rarely, about every 100,000 to 200,000 years or more), but the total annual CO2 emissions from human activities is like one or more Yellowstone-sized super eruptions going off every year.

Mato989 je 15. jun 2023 ob 10:03 izjavil:

Za konec smo pa pri ironiji... koliko CO2ja spuščamo v luft zato ker smo poslali orožje Ukrajini? A pri Ukrajini pa več ni važno izpuščanje CO2 ki je posledica naše pomoči? Na drugi strani bi pa krave klali pa zapirali farme na Nizozemskem... je to smiselno? Če bi se nam res šlo za ozračje bi Ukrajino NATO zradiral da bi bilo čimprej konec, ker bi tako manj CO2 porabili... (Ker Rusijo je težje bi porabili več CO2)

Se pravi smo zelo kontradiktorni kajne?

trancer01 je 16. jun 2023 ob 06:59 izjavil:

Da je neizpodbitno dejstvo, da je človek odgovoren za spremembo podnebja, lahko izreče le umsko zaostal človek.

svecka je 16. jun 2023 ob 07:08 izjavil:

Kdo je kriv za ledene dobe skozi miljone let?
Kdo je kriv za C02 v času dinozavrov, ki je bil 5x višji?
Kdo je kriv za temperaturna nihanja skozi tisočletja (male ledene dobe)?

Tudi če nas ne bi bilo bi bilo na Zemlji bi bila ta segrevanja in ohlajevanja še zmeraj prisotna. To je pač naravni cikel, samo ste nekateri padli na foro globalnega osnaževanja, kjer si posamezniki na vaš naiven račun bašejo žepe. Briga njih za prihodnost, oni živijo zase.

.

pegasus je 16. jun 2023 ob 07:13 izjavil:

I'll just leave this here: https://phys.org/news/2023-06-weve-grou...

fulk je 17. jun 2023 ob 11:33 izjavil:

pegasus je 16. jun 2023 ob 07:13 izjavil:

I'll just leave this here: https://phys.org/news/2023-06-weve-grou...

ahahahahahahahahaha

Pega, ti si nepobolšljiv doomer.
Masturbiraš nad vse kar je apokaliptično.


Drugače pa za kow-a in podobne.
Vse kar je establišment tako pumpal, se je eventuelno izkazalo za nateg.
Zakaj bi bilo tokrat drugače?

bbbbbb2015 je 17. jun 2023 ob 11:53 izjavil:

Menim, da sploh ne gremo v slabo smer, vsaj kar se Slovenije tiče. Eni gredo bistveno na bolje, recimo Sibirija, eni gredo na opazno slabše - Španija, jug Francije. Je tudi res, da v Španiji gojijo enormne količine zelenjave, zaradi osončenosti, zato imajo enormno porabo vode. Kot so v enem prispevku rekli, saj za same ljudi niti ne zmanjka, samo namakati vse tiste površine - to pa ziher zmanjka

fulk je 17. jun 2023 ob 12:54 izjavil:

Kowi in pegasusi pa delajo paniko.

pegasus je 19. jun 2023 ob 08:32 izjavil:

Jah saj vidiš ... preko svojih 4k monitorjev vidijo samo do paradajza in mislijo da so ful v stiku z naravo ... a samo ponosno razkazujejo svojo omejenost. Namesto da bi o letini povprašali kake sadjarje ali čebelarje ...