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On 14 Aug 2022 09:50:34 GMT, Robert Latest <boblatest@yahoo.com>
wrote:
How did earth ever emerge from irreversible ice-age albedo feedback?
Emotional guessing about control theory doesn\'t work. Positive
feedback doesn\'t necessarily latch, but most people think it does.
wrote:
Anthony William Sloman wrote:
Actually the usual meaning of \"tipping point\" in this context is where global
warming has gone far enough to generate enough environmental change that
global warming would keep on getting worse even if we managed to reduce
atmospheric CO2 levels below 270 ppm.
When the Arctic sea ice finally goes away and the Arctic Ocean stays ice-free
all the year round the albedo of that region will go up quite a bit - that
kind of thing. It\'s talking about an irreversible result.
\"Irreversible\" in this context means: within the time frame of the existence of
the human species, or human civilization as we know it. Which is maybe
thousands of years (species) or decades (civilization). Earth has been swinging
back and forth between more extreme conditions, but each time with what amounts
to a complete overhaul of the biosphere. Pockets of humans may survive such
swings in some parts of the world, but not under conditions that I want to.
How did earth ever emerge from irreversible ice-age albedo feedback?
Emotional guessing about control theory doesn\'t work. Positive
feedback doesn\'t necessarily latch, but most people think it does.