The sad and alarming finding that 7 of the 9 “boundaries of the planet” have now been overcome, since the level of ocean acidification exceeded the limit compatible with steady and sustainable ecosystems, made the Institute of Research for Pochdam’s climate (Pik)
The concept of the “boundaries of the planet” was set in 2009 by about 30 researchers, who then valued that humanity had “exceeded at least three limits on the planet”.
Since then, his annual reports (PIK) have been constantly downgrading.
The report for 2025 was presented at a teleconference from New York where the UN General Assembly is being held.
What are the 7 “boundaries of the planet” that were overcome
The account of 2025 shows that the threshold of ‘ocean acidification’ just overcome. “The ocean has acidification, which threatens marine life and leads us to dangerous conditions,” while presenting “more deterioration,” the researchers said.
The other six planetary boundaries already overcome are:
– climate change (CO2 in the atmosphere),
– integrity of the biosphere (disappearance of species and owed resources by humanity),
– use of land (deforestation),
– cycle of freshwater (zones affected by drought or floods),
– them biogeochemical cycles (addition of fertilizers and pesticides) and
– Introduction of new entities into the biosphere (plastic and other industrial chemicals).
The 2 “limits of the planet” not exceeded:
– the aerosols in the atmosphere (air pollution) and
– the ozone level In the stratosphere.
What does it mean ‘Ocean acidification’
The oceans, which cover 70% of the planet’s surface, account for 97% of water on Earth.
As the acidity is measured with the help of pH, the reference to this limit is the concentration of Aragonite, a metal necessary for the life of corals and shellfish.
The more acidic the ocean is, the more the aragonite dissolves.
The limit was set at 80% of the concentration in the pre -industrial era, and the oceans have fallen below this level.
“The pH on the surface of the ocean has already fallen by about 0.1 since the beginning of the industrial age. This is equivalent to an increase of 30 to 40% of acidity, “scientists said.
“This change threatens organisms that form shells or skeletons of calcium carbonate, such as corals, molluscs or species that are critical to plankton. The gradual disappearance of these organisms may disrupt the dietary chain“, They warned.
The main cause of ocean acidification is the absorption of carbon dioxide (CO2) emitted by the burning of fossil fuels. Scientists estimate that the oceans have absorbed about 30% of the surplus CO2 released into the atmosphere by burning oil, gas and carbon.
The increase in acidification over the figures published last year is also partly due to the improvement of data and a revision of calculations.
Source: Skai
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