Planetary Health Check 2026: Seven out of nine planetary boundaries have already been significantly exceeded
Planetary boundaries describe nine key processes of the Earth system. If their safe operating spaces are exceeded, the risk increases that our planet’s vital systems will undergo permanent changes.
The 2026 Planetary Health Check reveals a clear trend: Seven of the nine planetary boundaries are now outside the safe operating space. Most recently, in 2025, the boundary for ocean acidification was also exceeded.
This affects climate change, the integrity of the biosphere, changes in land use, changes in the freshwater cycle, biogeochemical cycles, the introduction of anthropogenic substances, and ocean acidification.
The situation has improved over the past decade only with regard to the ozone layer and global aerosol pollution in the atmosphere. Regarding aerosols, however, the report points out that global trends may mask regional pollution levels.
A Year of Extreme Events Highlights Growing Risks
The report examines the evolution of planetary boundaries in relation to numerous extreme events on land and in the oceans. The severity of their consequences depends not only on the climate, but also on the state of ecosystems, water availability, land use, and people’s ability to adapt to change.
In 2025, more than 6.9 million people in Pakistan were affected by monsoon floods. At the same time, the heat content of the oceans reached a new record high.
The impact is particularly evident in the oceans: From January 2023 to September 2025, approximately 84.4 percent of the world’s coral reef area was exposed to heat stress, which can trigger coral bleaching. According to the report, this was the largest event of its kind ever observed worldwide.
Europe was also affected by extreme weather conditions. In 2026, Western Europe experienced its hottest June and July on record. At the same time, severe droughts struck France, Spain, Germany, and the United Kingdom. Severe wildfires broke out in Europe and Canada. Japan, South Korea, and parts of the Middle East also recorded record-breaking temperatures.
The report’s key message: These developments should not be viewed as separate crises. Climate, water, ecosystems, land, and oceans all influence one another.
Natural Carbon Sinks Under Pressure
Natural carbon sinks play a special role. Vegetation and soils absorb a significant portion of human-caused CO₂ emissions.
However, recurring heat waves, droughts, wildfires, and damaged ecosystems can reduce this absorption. As a result, ecosystems in some regions may transform from CO₂ sinks into CO₂ sources.
The Planetary Health Check therefore also examines whether models of terrestrial carbon sequestration may be overestimating their resilience. This is relevant because the path to net-zero emissions also depends on natural carbon sinks continuing to function.
Why the planetary boundaries are interconnected
The seven boundaries that have been crossed show that environmental changes cannot be viewed in isolation from one another. For example, deforestation affects the climate and the water cycle. Rising temperatures, in turn, impact ecosystems and the oceans.
At the same time, trends in the ozone layer show that improvement is possible. International measures have helped reduce the pressure on this Earth system.
The challenge, therefore, is not merely to prevent further overshoots. In the long term, the goal is to bring the planetary boundaries that have already been exceeded back toward a safe range.
Learn More
Planetary Health Check 2026
https://www.planetaryhealthcheck.org/
Original publication: Planetary Boundaries Science (PBScience), 2026: Planetary Health Check 2026. Potsdam Institute for Climate Impact Research, Potsdam, Germany.






