At the end of June, two NOAA employees made their annual trek to Prince William Sound, Alaska, for the 20th year in a row. Alan Mearns, a Seattle-based scientist at NOAA’s Office of Response and Restoration, and John Whitney, NOAA’s Scientific Support Coordinator for Alaska, conducted the 20th annual survey of the western portion of the sound, where the Exxon Valdez tanker made infamous environmental history on March 24, 1989....