Seven of the Nine Planetary Boundaries Have Now Been Crossed
The planetary-boundaries framework tracks nine processes essential to the Earth system. The 2025 assessment concludes that seven boundaries have now been crossed.
How far can humanity push the Earth without destabilising the very conditions that make our societies possible?
The planetary-boundaries framework, developed by an international team of researchers, addresses this question through nine biophysical processes that maintain the stability of the Earth system, each with a threshold that should not be exceeded.
The nine gauges on the dashboard
The framework tracks nine processes that regulate planetary stability. Seven are now considered crossed, while two remain within the safe operating space:
- Climate change
- Biodiversity loss
- Nitrogen and phosphorus cycles
- Land-system change
- Freshwater change
- Ocean acidification
- Novel entities: plastics, pesticides and synthetic chemicals
- Stratospheric ozone depletion
- Atmospheric aerosol loading
The framework is valuable because it shows that these processes are interconnected. Degrading soils affects the climate, which affects freshwater, which in turn affects biodiversity.
A direction of travel, not a countdown
Crossing a boundary does not trigger immediate collapse. It means leaving the safe operating space and facing a growing risk of abrupt and irreversible shifts.
The framework also carries a positive lesson: the recovery of the ozone layer through coordinated international action shows that returning to the safe zone is possible when humanity commits the necessary resources.
- Nine processes regulate planetary stability, and seven thresholds have already been crossed.
- The boundaries are interconnected: weakening one places additional pressure on the others.
- The recovery of the ozone layer proves that reversing course is possible.