With trees being cut down in the Rain Forest among other things there is more and more carbon dioxide entering the Earth’s atmosphere. This is causing the oceans to become more acidic. This acidification if killing coral, helping algae flourish, and causing fish ear bones to grow bigger than normal. The carbon dioxide puts large amounts of magnesium sulphate and boric acid into the ocean. These are sound absorbers and are becoming more concentrated in the water. This is why it is getting harder for water animals to hear. Many of the animals use sonar to navigate at these depths and with a reduced scense of hearing it will make this difficult. Researchers suggest that the sound absorption could fall about 60 percent in high latitudes and deep waters within the next couple of centuries. This was very interesting to hear that the carbon dioxide is affecting ocean life as well as the many other things it does on land. This article gives a more scientific explanation for what is happening.