. >> we're here at the national press club talking with paul greenberg about his new book, "four fish." can you tell us why are these four fish the future of the last wild food? >> well, when you look at what we eat from the land, we've pretty much chosen four mammals, cows, pigs, sheep and devotes. when you -- goats. we've chosen four birds, turkeys, chickens, ducks and geese. and right now we're on the vrnlg of choosing domesticated forms of fish. the choices we make, which fish we choose to domesticate and which we choose to leave wild will have huge ramifications for the future of the ocean. >> how so? >> well, if you look, for example, salmon, a very popular farm fish, salmon require as much as 3-6 pounds of wild fish to grow a single pound of salmon, so if we're going to take all these little fish, grind them up, feed them to salmon, we're going to end up depleting the ocean, and there are other fish out will that don't require those kinds of huge, you know, deductions from the ocean. tilapia, for example. it's a vegetarian fish and a very sustainable fish. you know, it's those