In this year’s #PlanetaryHealthCheck (https://www.pik-potsdam.de/en/news/latest-news/seven-of-nine-planetary-boundaries-now-breached-2013-ocean-acidification-joins-the-danger-zone), the #OceanAcidification boundary has been assessed as breached for the first time. What does this mean? Nice explanatory piece in “Dialogue Earth”, with input from PIK researcher Levke Caesar.

https://dialogue.earth/en/ocean/explainer-the-latest-science-on-ocean-acidification/

We often discuss the threat of #OceanAcidification (and #Climate Change ) on shallow reefs, but it does not spare deep reefs. As the #ocean acidifies, the aragonite saturation horizon shallows, and with it the zone many #reef builders can inhabit.

Link: https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2024JC021750

Ocean Acidification Crossed A Critical Boundary, Threatening Marine Ecosystems

"How quickly can we change ocean chemistry without damaging marine ecosystems and its associated ecosystem services?"

#SciComm by @GrrlScientist

#CriticalBoundary #Ocean #OceanAcidification #marine #MarineBiology #Ecosystem https://medium.com/grrlscientist/ocean-acidification-crossed-a-critical-boundary-threatening-marine-ecosystems-ad8463cd3350

Ocean Acidification Crossed A Critical Boundary, Threatening Marine Ecosystems

"How quickly can we change ocean chemistry without damaging marine ecosystems and its associated ecosystem services?"

#SciComm by @grrlscientist

#CriticalBoundary #Ocean #OceanAcidification #marine #MarineBiology #Ecosystem https://medium.com/grrlscientist/ocean-acidification-crossed-a-critical-boundary-threatening-marine-ecosystems-ad8463cd3350

Ocean Acidification Crossed A Critical Boundary, Threatening Marine Ecosystems

"How quickly can we change ocean chemistry without damaging marine ecosystems and its associated ecosystem services?"

#SciComm by @GrrlScientist

#CriticalBoundary #Ocean #OceanAcidification #marine #MarineBiology #Ecosystem #conservation https://medium.com/grrlscientist/ocean-acidification-crossed-a-critical-boundary-threatening-marine-ecosystems-ad8463cd3350

Ocean Acidification Crossed A Critical Boundary, Threatening Marine Ecosystems

"How quickly can we change ocean chemistry without damaging marine ecosystems and its associated ecosystem services?"

#SciComm by @grrlscientist

#CriticalBoundary #Ocean #OceanAcidification #marine #MarineBiology #Ecosystem #conservation https://medium.com/grrlscientist/ocean-acidification-crossed-a-critical-boundary-threatening-marine-ecosystems-ad8463cd3350

From the recent report of the European Environmental Agency. The Exceedance of six of nine planetary boundaries

https://www.eea.europa.eu/en/europe-environment-2025/main-report/exceedance-of-six-of-nine/@@images/preview_image-3751-faa9578e439525702a8347d1e77a42b4.png

#ClimateChange #biodiversity #biosphereintegrity #LandSystemChange #Freshwater #OceanAcidification

The Planetary Health check has now diagnosed ocean acidification to be outside the safe operating space:
https://www.planetaryhealthcheck.org
PIK press release:
https://www.pik-potsdam.de/en/news/latest-news/seven-of-nine-planetary-boundaries-now-breached-2013-ocean-acidification-joins-the-danger-zone

Short article quotes one of the researchers, Levke Caesar, with "I am afraid. This really scares me." https://www.theguardian.com/environment/2025/sep/24/worlds-oceans-fail-key-health-check-as-acidity-crosses-critical-threshold-for-marine-life

I have questions.
For all of the previous 200 million years, CO2 was at a stable 1000ppm. Far higher than our goal-apparent of 600ppm, see picture of temperature and CO2 evolution after Judd, Tierney et al 2024 https://www.science.org/doi/abs/10.1126/science.adk3705

If those little snails from the PIK press release are already negatively affected from today's 430ppm, does that mean, their DNA only evolved during the last 2-3 million years, and rather suddenly, once CO2 dropped below this magical threshold?

Note also how CO2=ocean acidification never caused an extinction, only temperature did.
Surely, if the dying of the little critters were a precursor for an impending marine extinction event, it would have happened before? From 350 to 300 million years ago for example. Ample time for low-acidity-DNA like snails to evolve, and go extinct again when CO2 rose.

Whales have been around for 54mio years, in very high-CO2 times as well. What did they eat if snails weren't on the menu [of their prey]?
What did sharks eat at 1000ppm? They are truly old beings, 350 million years and more.
#PlanetaryBoundaries #climateChange #OceanAcidification #marinelife

1-Oct-2025
#Corals might be adapting to #climateChange
((but probably not fast enough I would suspect?))
specifically this is about #oceanAcidification

https://www.eurekalert.org/news-releases/1100489

#science #ClimateCatastrophe #environment #ecology #MarineBiology

WRITER FUEL: Researchers have found that ocean acidification entered a "danger zone" in 2020, suggesting increased carbon dioxide levels have caused Earth to breach another planetary boundary.

https://www.limfic.com/2025/10/02/writer-fuel-ocean-acidification-is-a-ticking-time-bomb/

#WriterFuel #WritingIdeas #Ideas #OceanAcidification #ClimateChange