Scientists say that the acidity of the world's oceans is slowly becoming stronger and stronger. Researchers from California say this change is a response to the increase in carbon dioxide content in the atmosphere. They warned that the decline of seawater pH is not serious at present, but if it continues, it may pose a serious threat to current marine life. Ken caldeira and Michael Wincott of Lawrence Livermore National Laboratory reported their concerns in Nature. The increase in the use of fossil fuels means that more carbon dioxide is emitted into the air, and most of it will eventually be absorbed by seawater. Once in the water, it will react to produce carbonic acid. Scientists believe that in the past century, the ocean has become slightly more acidic. But these researchers try to predict what will happen in the future by combining our understanding of ocean history with computer models of climate change. "If we continue to release carbon dioxide into the atmosphere, this acidity level will become more extreme in the future," Dr. Caldeira said. "We predict that the future acidity will exceed anything we have seen in the past hundreds of millions of years, except perhaps after rare catastrophic events such as asteroid impact." The authors warn that if the release of carbon dioxide continues unabated, the pH value of the ocean may decrease by as much as 0.77 units. However, what this means for marine life is not very clear. Most organisms live near the surface, where the largest pH change is expected, but deep-sea organisms may be more sensitive to pH changes. The research team speculated that coral reefs and other organisms whose bones or shells contain calcium carbonate may be particularly affected. They may find it much more difficult to build these buildings in water with low pH value. In recent years, some people suggest that carbon dioxide emitted by power stations should be stored in the deep sea deliberately to curb global warming. But Dr Caldeira says it's time to rethink this strategy. "In the past, most experts thought that it was a good thing for the ocean to absorb carbon dioxide-because releasing carbon dioxide into the atmosphere would warm the earth; When carbon dioxide is absorbed by the ocean, it reduces the greenhouse effect. Scientists say that the world's oceans are slowly turning sour. Researchers from California say this change is due to the high carbon dioxide content in the atmosphere. They warned that at present, the decline of seawater pH value is not very serious, but if it continues to decline, it will pose a serious threat to existing marine life. Ken Caldeiro and Michael Wincott from Livermore National Laboratory in Rolland, USA, raised their concerns in Nature. More and more oil consumption means that more carbon dioxide is emitted into the air, and most of it will eventually be absorbed by seawater. Once carbon dioxide enters the water, it will react to produce carbonic acid. Scientists believe that the acidity of the ocean has been slightly higher than that of the last century. These researchers try to predict future changes by combining known computer models of ocean history and climate change. " If we continue to emit carbon dioxide into the atmosphere, the future acid concentration will far exceed the standard. "Dr. Caldero said, and we estimate that the total amount of acid in the future will be larger than anything that humans have seen in the past hundreds of millions of years, not to mention the possibility of a rare catastrophe like an asteroid hitting the earth. "The researchers warned that if carbon dioxide emissions are not reduced, the pH value of the ocean may decrease by 0.77 units. Although it is not clear what this means to marine life. Most organisms live on the ocean surface, which is the place where the pH value is expected to change the most, but deep-sea organisms may be more sensitive to the pH value change. The research team speculated that coral reefs and other organisms with calcium carbonate in their bones or shells may be particularly affected, and it is difficult for them to form these structures in low pH water. In recent years, it has been deliberately suggested that carbon dioxide released by power stations be stored in the deep sea to curb global warming. But Dr. Cardet Rowe says it's time to reconsider this strategy. In the past, most experts regarded the absorption of carbon dioxide by the ocean as a good thing-because releasing carbon dioxide into the atmosphere will warm the atmosphere, but when carbon dioxide is absorbed by the ocean, the greenhouse effect will decrease. "