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From: Jim Pennino <jimp@gonzo.specsol.net>
Newsgroups: sci.physics,alt.conspiracy,alt.global-warming
Subject: Re: Ways to convince people to continue to study physics
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Date: Sat, 8 Jun 2024 12:02:43 -0700
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In sci.physics Loran <loran@invalid.net> wrote:
> Jim Pennino wrote:
>> In sci.physics Dave <dwickford@yahoo.com> wrote:
>>> Going forward in technology and society, and mindful of the climate
>>> emergency,
>> 
>> The Earth's climate has been in a continuous state of flux for about 4.5
>> billion years and has gone through numerous icehouse and greenhouse
>> states.
>> 
>> A greenhouse state is when no continental glaciers exist anywhere and an
>> icehouse state is when continental glaciers do exist.
>> 
>> For 85% of its history, The Earth has been in a greenhouse state.
>> 
>> Understanding Earth's Deep Past. 2011-08-02. doi:10.17226/13111.
>> ISBN 978-0-309-20915-1
>> 
>> Earth is currently in an icehouse state with continental glaciers present
>> on both poles.
>> 
>> Sounds to me like business as usual for the Earth's climate.
>> 
>> 
> Consider:
> 
> 
> https://www.forbes.com/sites/larrybell/2011/05/03/breaking-news-the-climate-actually-changes/
> 
> "Fossil records reveal that atmospheric CO2 levels around 600 million 
> years ago were about 7,000 parts per million, compared with 379 ppm in 
> 2005. Then approximately 480 million years ago those levels gradually 
> dropped to 4,000 ppm over about 100 million years, while average 
> temperatures remained at a steady 72 degrees. They then jumped rapidly 
> to 4,500 ppm and guess what! Temperatures dove to an estimated average 
> similar to today, even though the CO2 level was around twelve times 
> higher than now. Yes, as CO2 went up, temperatures plummeted.
> 
> About 438 million years ago, atmospheric CO2 dropped from 4,500 ppm to 
> 3,000 ppm, yet according to fossil records, world temperatures shot 
> rapidly back up to an average 72 degrees. So regardless of whether CO2 
> levels were 7,000 ppm or 3,000 ppm, temperatures rose and fell 
> independently.
> 
> Over those past 600 million years there have been only three periods, 
> including now, when Earth's average temperature has been as low as 54 
> degrees. One occurred about 315 million years ago, during a 
> 45-million-year-long cool spell called the Late Carboniferous period, 
> which established the beginning of most of our planet's (gasp) 
> coalfields. Both CO2 and temperatures shot back up at the end of it just 
> when the main Mesozoic dinosaur era was commencing. CO2 levels rose to 
> between 1,200 ppm and 1,800 ppm, and temperatures again returned to the 
> average 72 degrees that Earth seemed to prefer.
> 
> Around 180 million years ago, CO2 rocketed up from about 1,200 ppm to 
> 2,500 ppm. And would you believe it? This coincided again with another 
> big temperature dive from 72 degrees to about 61 degrees. Then at the 
> border between the Jurassic period when T. Rex ruled and the Cretaceous 
> period that followed, CO2 levels dropped again, while temperatures 
> soared back to 72 degrees and remained at that level (about 20 degrees 
> higher than now) until long after prodigious populations of dinosaurs 
> became extinct. And flatulent as those creatures may possibly have been, 
> at least there is no evidence that they burned coal or drove SUVs.
> 
> Based upon a variety of proxy indicators, such as ice core and 
> oceansediment samples, our planet has endured large climate swings on a 
> number of occasions over the past 1.5 million years due to a number of 
> natural causes. Included are seasonal warming and cooling effects of 
> plant growth cycles, greenhouse gases and aerosols emitted from volcanic 
> eruptions, Earth orbit and solar changes, and other contributors with 
> combined influences. Yet atmospheric CO2 levels have remained relatively 
> low over the past 650,000 years, even during the six previous 
> interglacial periods when global temperatures were as much as 9 degrees 
> warmer than temperatures we currently enjoy.
> 
> Over the past 400,000 years, much of the Northern Hemisphere has been 
> covered by ice up to miles thick at regular intervals lasting about 
> 100,000 years each. Much shorter interglacial cycles like our current 
> one lasting 12,000 to 18,000 years have offered reprieves from bitter 
> cold. Yes, from this perspective current temperatures are abnormally 
> warm. By about 12,000 to 15,000 years ago Earth had warmed enough to 
> halt the advance of glaciers and cause sea levels to rise, and the 
> average temperature has gradually increased on a fairly constant basis 
> ever since, with brief intermissions."
> 

With significant changes taking tens of thousand of years, where is
the "emergency"?