The National Oceanic and Atmospheric Administration (NOAA) has acknowledged the link between certain types of sonar and negative impacts on marine mammals, including death. In an letter to the Council on Environmental Quality last week, NOAA Administrator Jane Lubchenco proposed that marine mammal "hot spots"—areas where marine mammals are in high abundance—become off limits to mid-frequency active sonar testing. (Lubchenco is, by the way, the first woman AND the first marine ecologist to lead NOAA. Huzzah!)
According to this LA Times blog post, NOAA is also calling for a process to estimate the "comprehensive sound budget for the oceans." This is a huge step in developing a plan to protect marine species that rely on underwater communication. It’s critical, too, in light of the new findings that link ocean acidification with the decreased transmission of underwater sound (see this recent post.)
The letter from Lubchenco to the CEQ is available here (PDF).