Noise pollution is an ever-increasing threat to orcas and other cetaceans worldwide. NOAA is leading a remarkable effort to “document human-made noises in the ocean and transform the results into the world’s first large sound maps.” (NY Times, 12/11/12) Read more about it here.
http://www.nytimes.com/2012/12/11/science/project-seeks-to-map-and-reduce-ocean-noise-pollution.html?ref=science