William P Hall, PhD

@WilliamHallPhD
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Earth Systems Scientist @VoteClimateOne
● Engineering Documentation and Knowledge Management Systems Analyst & Designer (Tenix Defence - 17 yrs, retired 2007)
● Academic (PhD Harvard 1973: Evolutionary Biology)
Other threads: geology (paleontology & plate tectonics), physics (mechanics, thermodynamics, nuclear & astro-), biology (marine, oceanography, anatomy, neurophysiology, systems & radiation ecology, genetics & cytogenetics, biogeography, cybernetics), epistemology, organization theory.
William P Hall, PhDMay 7, 2024

Re thermal limits see: https://www.nature.com/scitable/knowledge/library/physiological-optima-and-critical-limits-45749376/ & https://www.nature.com/articles/s41467-021-21263-8

Physiological limits to heat tolerance will remove some species immediately. Other species' survival normally depends on presence of other species for 'services'. Extinction of a keystone species leads to extinctions of many others where some aspect of life-cycle requires presence of keystone... and so on. See https://en.wikipedia.org/wiki/Systems_ecology, ...Ecosystem_services, ...Ecosystem_collapse, ...Extinction, ...Ecological_niche.

Physiological Optima and Critical Limits | Learn Science at Scitable

Organismal distribution limits and responses to climate change depend on how physiological performance varies as the environment shifts between optimal and extreme conditions.

Show threadWilliam P Hall, PhDMay 6, 2024
@JeffC1956
What the climate was like 5 or 50 million years ago is less important than the last 2.5 m yr. For most of that period temps were significantly colder than today's, and there was only a brief period in the Eemian when they were 1-2 °C hotter than now. Most orgs (micro-macro) now live close to thermal limits. At present rates max temps will be 3-5 °C hotter within a few decades, even microorganisms will find it difficult to adapt fast enough. Possibly only extremophiles will survive.
Show threadWilliam P Hall, PhDMay 5, 2024

@JeffC1956

Unfortunately, our chosen road to extinction will take most of the biosphere down with us. Indications so far is that the End Anthropocene extinction will be at least one order of magnitude faster than the End Permian was, and probably reach an even higher peak warming.

The absolute madness is that so far we are doing nothing to even slow the increasing imbalance between solar energy in and Earth infrared energy out that is driving temps up.

William P Hall, PhDMay 5, 2024

https://www.abc.net.au/news/science/2024-03-18/wa-summer-heat-broke-records-but-media-downplayed-climate-change/103572922

WA had its hottest summer ever, but climate change and heat-related health problems barely made the news.

Most news items have focused on impact of extreme heat on sports fixtures than any comment on the connection with #ClimateChange and implications for our future.

Isn't it time we started putting our feet on the brakes and turning off the downhill freeway to extinction?

@VoteClimateOne, #ClimateSentinelNews, #climatecrisis, #extremeweather, #heat #extinction

WA had its hottest summer ever, but climate change and heat-related health problems barely made the news

Most stories during WA's record-breaking heatwave last month didn't mention the health risks of extreme heat and the link with climate change, despite overwhelming scientific evidence, according to an analysis of how news outlets reported on the event.

ABC News
William P Hall, PhDMay 5, 2024

https://www.abc.net.au/news/2024-05-03/climate-change-reality-hits-home-in-rural-community/103779236

This is one of many simultaneous indicators that life on Earth is headed towards oblivion in Hothouse Hell. Every year of inaction pushes us closer to social collapse, ecological collapse and extinction. #GlobalWarming, #ClimateEmergency, #ClimateCrisis, #extremeweather, #Drought, #Australia

Parched south-west is 'canary in the coal mine' reflecting Australia’s climate change reality

While floods in the eastern states have dominated headlines, many creeks in the west have stopped flowing, dams are empty, paddocks are bare and trees are dying. But all bear the fingerprints of a changing climate.

ABC News
William P Hall, PhDMay 3, 2024

~90% solar energy captured by Earth goes first into the ocean for distribution. Current accelerating rate of temp rise = extinction < 100 yrs if warming not stopped. Rapid emergency global mobilization needed!

To protect their special-interest patrons, today's governments are working to stop or delay mobilization.To hope for a viable future, governments must accept that the risks exist and help organize and lead the war effort. Visit @VoteClimateOne
for info on government change.
#CimateCrisis