World's oceans near critical acidification level: report

PARIS:

The world's oceans are close to becoming too acidic to properly sustain marine life or help stabilise the climate, a new report said on Monday.

The report by the Potsdam Institute for Climate Impact Research (PIK) details nine factors that are crucial for regulating the planet's ability to sustain life.

In six of these areas, the safe limit has already been exceeded in recent years as a result of human activity.

The crucial threshold for ocean acidification could soon become the seventh to be breached, according to the PIK's first Planetary Health Check.

The safe boundaries that have already been crossed concern crucial - and related - factors including climate change; the loss of natural species, natural habitat and freshwater; and a rise in pollutants, including plastics and chemical fertilisers used in agriculture.

The sustainable level of ocean acidification is now also set to be exceeded, largely as a result of ever-increasing emissions of carbon dioxide (CO2) created by burning fossil fuels like oil, coal and gas. "As CO2 emissions increase, more of it dissolves in sea water... making the oceans more acidic," Boris Sakschewski, one of the lead authors, told reporters.

"Even with rapid emission cuts, some level of continued acidification may be unavoidable due to the CO2 already emitted and the time it takes for the ocean system to respond," he explained.

"Therefore, breaching the ocean acidification boundary appears inevitable within the coming years."