Life on Earth depends on a delicate balance between ecosystems like rainforests, glaciers, oceans, and volcanoes, along with interconnected climate cycles. Around a decade ago, Johan Rockström, director of the Potsdam Institute for Climate Impact Research (PIK), introduced the concept of “nine planetary boundaries”—tipping points beyond which Earth’s ecosystems may no longer sustain life. In the 2024 Planetary Health Check Report, Rockström revealed that six of these boundaries have already been breached, and a seventh is nearing collapse due to human activities, posing a severe threat to life on Earth.
These findings were published in Science Advances. According to the Global Commons Alliance, the nine planetary boundaries include “biosphere integrity, climate change, land-system change, freshwater use, nutrient cycles, ocean acidification, aerosol pollution, ozone depletion, and novel entities like plastic pollutants.” Of these, six have already been disrupted, and the seventh—ocean acidification—is nearing its critical threshold, according to the 2023 health-check report.
“Our updated diagnosis shows that vital organs of the Earth system are weakening, leading to a loss of resilience and rising risks of crossing tipping points. Six of the nine planetary boundaries are transgressed and put into context in the report by high-resolution spatial maps of local and regional trends for all nine boundaries. The message is clear, local actions impact the planet, and a planet under pressure can impact everyone, everywhere. Securing human well-being, economic development, and stable societies requires a holistic approach where the protection of the planet takes center stage,” Levke Caesar, PIK Scientist and study lead author, said in a statement.
In addition to this, Johan, who referred to planet Earth as a “patient,” said, “The overall diagnostic is that the patient, Planet Earth, is in critical condition. Six of nine Planetary Boundaries are transgressed. Seven PB processes show a trend of increasing pressure so that we will soon see the majority of the Planetary Health Check parameters in the high-risk zone.”
Furthermore, the study revealed that the planetary boundary of climate change is in a high-risk zone, and the boundaries in land system change and freshwater change have also been transgressed, although to a lesser extent. Stratosphere ozone depletion has remained stable, according to The Guardian, but surprisingly, the atmospheric aerosol loading boundary has improved. But when it comes to the ocean acidification boundary, it is already at the tipping point. Ocean acidification, as per The Guardian, is “the phenomenon of increasing acidity (decreasing pH) in ocean water due to the absorption of atmospheric carbon dioxide.” Accumulation of excess carbon dioxide can pose a threat to living species that thrive in oceanic underwater.
Hindou Oumarou Ibrahim, Chair of the Planetary Guardians, said that indigenous people lived in harmony with the planet’s critical life-supporting processes for centuries, and replenished the overall health of Earth. But now, he said, people are killing life with an overdose of chemicals, destruction of nature, skyrocketing temperatures, and rising pollution. While these planetary health checks are vital for the effective functioning of Earth, they may not provide the answer to the perturbations caused by humans that are pushing the boundaries.
