Acidifying oceans are brewing up an underwater din
The ocean is getting noisier. Sound can now travel further than it did a century ago, thanks to carbon emissions that have made the oceans more acidic. Researchers have known for some time that acidity can influence how far sound travels in seawater. Oceans are becoming more acidic because of rising levels of CO2 in the atmosphere, which dissolves in seawater to form carbonic acid.