Last week, I had the pleasure of interviewing marine stewardship expert and ocean activist Casson Trenor for my column in the Faster Times . I'd come across Trenor's name while researching "sustainable sushi"—a relatively new concept at sushi restaurants here in the U.S., but one that's taking off as locavore diners turn their attention to where their fish is coming from. Then, by coincidence, Mark Bittman blogged about sustainable fish a few days later. Something is definit