As more and more carbon dioxide enters the Earth’s atmosphere, oceans are becoming more acidic . In fact, this acidification has been blamed for everything from killing off coral to aiding algae and even super-sizing fish ear bones . But the changing marine chemistry may also be altering the deep sea’s acoustic environment, according to a new paper, published online Sunday in Nature Geoscience reports ( Scientific American is part of Nature Publishing Group), making it much noisier for the animals that depend on sound to navigate the watery depths.  [More]