Scientists have issued a stark warning after new research revealed that coastal seas are acidifying far faster than previously estimated. The study, conducted by an international team of marine chemists and ecologists, shows that pH levels in many near-shore environments are declining at rates up to three times higher than those recorded in the open ocean.
Coastal regions are particularly vulnerable because they receive runoff from agriculture, industry, and urban development. These inputs introduce excess nutrients and carbon into the water, accelerating acidification. According to the researchers, this rapid shift in water chemistry threatens marine organisms that depend on stable pH levels, including shell-forming species such as oysters, mussels, and many plankton types that form the base of the marine food web.
Coral reefs—which already face pressure from warming waters and bleaching events—are at especially high risk. Lower pH levels weaken coral skeletons, reduce reef growth, and make it harder for reefs to recover from storms and heatwaves. Scientists warn that continued acidification could lead to widespread habitat loss, reduced fisheries productivity, and the collapse of coastal ecosystems that support millions of people.
The researchers call for urgent action, including stricter emissions reductions, improved coastal management, and expanded monitoring programs to track chemical changes in vulnerable regions.
