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From: -hh <recscuba_google@huntzinger.com>
Newsgroups: comp.os.linux.misc,comp.os.linux.advocacy
Subject: Re: GIMP 3.0.0-RC1
Date: Fri, 3 Jan 2025 13:37:19 -0500
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On 1/3/25 11:43 AM, The Natural Philosopher wrote:
> On 03/01/2025 16:31, Chris Ahlstrom wrote:
>> The Natural Philosopher wrote this post while blinking in Morse code:
>>
>>> On 03/01/2025 13:32, -hh wrote:
>>>> Sea levels have already risen by 4 inches since 1993, and hard science
>>>> has found the primary energy imbalance reason why:  its anthropometric.
>>>
>>> Sea level rise has been 3mm/yr for the last 4000 years. Nothing has 
>>> changed
>>
>> This source disagrees:
>>
>>      https://ocean.si.edu/through-time/ancient-seas/sea-level-rise
>>
>> Also, sea level is *not* the same all over the world. The article 
>> mentions that
>> as well.
>>
>> It's an interesting read.
>
> Well I will merely quote from the Wiki:
> https://en.wikipedia.org/wiki/Past_sea_level
> 
> "Sea level has changed over geologic time. As the graph shows, sea level 
> today is very near the *lowest level ever attained*  (the lowest level 
> occurred at the Permian-Triassic boundary about 250 million years ago)."
> 
> "Recently, it has become widely accepted that late Holocene, 3,000 
> calendar years ago to present, sea level was nearly stable prior to an 
> acceleration of rate of rise that is variously dated between 1850 and 
> 1900 AD."
> 
> *Long before any CO2 excess was present*.

Yes, the rate of raise was nearly stable **before** the Industrial Age.

Which is the point:  the contemporary acceleration in the rate of rise 
is a change, and it is coincident with the advent of the Industrial Age.

Overall, sea level is kind of like driving down the highway:  it doesn't 
particularly matter if the speed limit is 55 or 65:  what matters is 
when there's a rapid rate of change.

When we look at the timescale of rates of change, we find that over the 
past 2000 years, the last 150 years stand out:

[quote]
Stable sea level from 200 BC until 1000 AD
A 400-year rise by about 6 cm per century up to 1400 AD
Another stable period from 1400 AD up to the late 19th C
A rapid rise by about 20 cm since.
[/quote]

TL;DR KISS:
~1200 years of ~0.0 mm/yr
~400 years of +0.6 mm/yr
~450 years of: -0.1 mm/yr
~1850-present: +2.1 mm/yr

<https://www.realclimate.org/index.php/archives/2011/06/2000-years-of-sea-level/>

Doing the math, the history is ~195mm over 2000 years = +0.1 mm/yr, 
which means that today's 2.1 mm/yr is a 20x greater rate of change.


-hh