The study touched upon climate crisis, deforestation, biodiversity loss, synthetic chemicals, freshwater depletion, and nitrogen use.
The planetary boundaries framework is a pillar of Earth system science, influencing policy and even business. Photo: AFP
Two of the remaining three -- ocean acidification along with the concentration of particle pollution and dust in the at mosphere -- are borderline, with only ozone depletion comfortably within safe bounds. "We are still moving in the wrong direction," said co-author Johan Rockstrom, director of the Potsdam Institute for Climate Impact Research and a co-creator of the schema.
For biodiversity, for example, if the rate at which species disappear is less than 10 times the average extinction rate over the last 10 million years, that is deemed acceptable. Thousands upon thousands of chemical compounds created by humans -- from microplastics and pesticides to nuclear waste and drugs that have leached into the environment -- were quantified for the first time in the new research and found to exceed safe limits.
It shows that even if humanity rapidly draws down greenhouse gas emissions, unless the destruction of carbon-absorbing forests is halted at the same time rising global temperatures could tip the planet onto a trajectory of additional warming that would be hard to stop.
France Dernières Nouvelles, France Actualités
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