"Scientists call for renewed global effort to curb fossil fuels as seven of nine planetary boundaries now transgressed"

"The world’s oceans have failed a key planetary health check for the first time, primarily due to the burning of fossil fuels, a report has shown.

In its latest annual assessment, the Potsdam Institute for Climate Impact Research said ocean acidity had crossed a critical threshold for marine life.

This makes it the seventh of nine planetary boundaries to be transgressed, prompting scientists to call for a renewed global effort to curb fossil fuels, deforestation and other human-driven pressures that are tilting the Earth out of a habitable equilibrium.

The report, which follows earlier warnings about ocean acidity, comes at a time of record-breaking ocean heat and mass coral bleaching."

Jonathan Watts reports for the Guardian September 24, 2025. [2]