According to an annual report from the Potsdam Institute for Climate Impact Research (PIK), global ocean acidification reached a critical point by 2025, already inflicting damage upon marine ecosystems.
The 2025 Planet Health Monitoring Report highlights a grave new development: the planetary boundary for ocean acidification has been officially surpassed. This alarming change, primarily fueled by the combustion of fossil fuels and compounded by deforestation and shifts in land use, is severely compromising the ocean`s crucial role as a global stabilizer.
Specifically, since the dawn of the industrial age, the pH of the ocean`s surface waters has fallen by approximately 0.1 units. This decrease translates to a 30-40% increase in acidity, pushing marine life beyond the limits of a safe environment.
The report emphasizes that cold-water corals, vibrant tropical coral reefs, and various Arctic marine species face heightened risks. For example, delicate sea snails, scientifically known as pteropods, are already exhibiting observable signs of shell deterioration.
Ocean acidification is identified as the seventh `critical planetary boundary` to be breached out of the nine key thresholds that define the safe operational space for humanity. Currently, only two boundaries — ozone layer depletion and atmospheric aerosol loading — remain intact.
Rupert Blackwood 
Clement Ashworth