In 2016, scientists added CO2 to seawater over a Great Barrier Reef patch for 30 days; net reef calcification fell 34% under future-like conditions
In a 30-day test on Australia’s Great Barrier Reef, scientists added CO₂ to seawater and found the reef built 34% less limestone than on comparison days.
We haven't written up this one. Hindustan Times - World News has the full story — the link below goes straight to it.