Human activity pushes Earth's life-support systems past critical limits

Scientists warn that industrial civilization may have breached seven of nine planetary boundaries vital for Earth's stability, including ocean acidification, which threatens marine ecosystems.

Damien Gayle reports for The Guardian.

In short:

• Ocean acidification is nearing a critical threshold, endangering marine organisms, especially in the Southern and Arctic Oceans.
• Six other planetary boundaries, including climate change and biosphere integrity, have already been crossed, destabilizing global systems.
• Stratospheric ozone levels remain stable, but worsening ocean acidification weakens the oceans' role in absorbing atmospheric CO2.

Key quote:

"This illustrates the connection between ocean acidification and biosphere integrity."

— Levke Caesar, climate physicist at PIK

Why this matters:

Crossing planetary boundaries risks disrupting the stable conditions Earth has maintained for 12,000 years, jeopardizing human civilization. Acidifying oceans threaten marine food webs and reduce their capacity to absorb CO2, worsening climate change impacts.

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