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Ocean acidification has already crossed a crucial threshold for planetary health, scientists say in unexpected finding

Until now, ocean acidification had not been deemed to have crossed its “planetary boundary”. The planetary boundaries are the natural limits of key global systems – such as climate, water and wildlife diversity – beyond which their ability to maintain a healthy planet is in danger of failing. Six of the nine had been crossed already, scientists said last year.

However, a new study by the UK’s Plymouth Marine Laboratory (PML), the Washington-based National Oceanic and Atmospheric Administration and Oregon State University’s Co-operative Institute for Marine Resources Studies found that ocean acidification’s “boundary” was also reached about five years ago.

The study: Impact of heatwave amplitude, duration, and timing on parasite fitness at different baseline temperatures

NGO says Afghan capital’s 7 million people face existential crisis that world needs urgently to address

The Mercy Corps report can be found here: Kabul’s Water Crisis - An Inflection Point for Action

Now, teams of government scientists are reporting widespread coral death, which they say is the worst bleaching to hit the state. There are still areas of live coral, and some bleached coral will recover, but as scientists gather data, the scale of mortality has left many shocked.

Dr Thomas Holmes coordinates the marine science program at the WA government’s Department of Biodiversity, Conservation and Attractions. [...] “I’m not afraid to use the word unprecedented,” he says.