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new study finds earth was upto +15C 500 mn y ago
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k***@gmail.com
2024-09-19 20:26:20 UTC
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[How Hot Was It?]
Earth's ancient `greenhouse' conditions were hotter than thought
Science News Magazine, 19 Sep 2024 18:17Z

Study charts how Earth's global temperature has drastically changed over the
past 485 mn years, driven by CO2
Phys.org, 19 Sep 2024 18:18Z
The new curve reveals that temperature varied more greatly during the
Phanerozoic than previously thought. Over the eon, the GMST spanned
between 52 and 97 degrees Fahrenheit (11-36 degrees Celsius). Periods
of extreme heat were most often linked to elevated levels of the
greenhouse gas carbon dioxide in the atmosphere.
"This research illustrates clearly that carbon dioxide is the dominant
control on global temperatures across geological time," said Jessica
Tierney, a paleoclimatologist at the University of Arizona and a
co-author of the new paper. "When CO2 is low, the temperature is
cold; when CO2 is high, the temperature is warm."
The findings also reveal that the Earth's current GMST of 59 degrees
Fahrenheit (15 degrees Celsius) is cooler than Earth has been over much
of the Phanerozoic. But greenhouse gas emissions caused by
anthropogenic climate change are currently warming the planet at a much
faster rate than even the fastest warming events of the Phanerozoic.
The speed of warming puts species and ecosystems around the world at
risk and is causing a rapid rise in sea level. Some other episodes of
rapid climate change during the Phanerozoic have sparked mass
extinctions.
"Humans, and the species we share the planet with, are adapted to a
cold climate," Tierney said. "Rapidly putting us all into a warmer
climate is a dangerous thing to do."

--
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[Humans == 40 Gt CO2/yr; volcanoes <0.1 Gt/yr].
Global carbon dioxide emission to the atmosphere by volcanoes
Volcanic CO2 presently represents only 0.22% of anthropogenic emissions but
may have contributed to significant "greenhouse" effects at times in Earth
history.
-- Science Direct

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citizen winston smith
2024-09-19 21:10:13 UTC
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Post by k***@gmail.com
Earth's ancient `greenhouse' conditions were hotter than thought
https://www.britannica.com/science/Tertiary-Period/The-rise-of-mammals

The most spectacular event in Cenozoic terrestrial environments has been
the diversification and rise to dominance of the mammals. From only a
few groups of small mammals in the late Cretaceous that lived in the
undergrowth and hid from the dinosaurs, more than 20 orders of mammals
evolved rapidly and were established by the early Eocene. Although there
is some evidence that this adaptive radiation event began well before
the end of the Cretaceous, rates of speciation accelerated during the
Paleocene and Eocene epochs.

https://pubmed.ncbi.nlm.nih.gov/10963587/

We estimate CO2 concentrations of more than 2,000 p.p.m. for the late
Palaeocene and earliest Eocene periods (from about 60 to 52 Myr ago),
and find an erratic decline between 55 and 40 Myr ago that may have been
caused by reduced CO2 outgassing from ocean ridges, volcanoes and
metamorphic belts and increased carbon burial.

You need to do some homework before you pop off again, peehole stretcher.
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