a near extinction of the world's fish population eight years ago boris worm a professor at del housey university in nova scotia projected that by twenty forty eight the world's salt water fish population could be almost entirely depleted as a result of overfishing pollution and climate change so does he still think that will happen and what are the consequences of global climate change on salt water fish a source of food for billions of people around the globe. joining me now from halifax nova scotia is dr boris worm professor at the dollhouse a university biology department dr worm welcome. thanks very much thank you for joining us am i pronouncing your university correctly. you do ok craig eight years ago you and your fellow researchers projected that salt water fish could be really significantly depleted by two thousand and forty eight how would you characterize that do you still believe that. you still believe that fisheries are you global crossroads we depleting fish stocks faster than they control box but what we do document since then is that the rate of depletion is slowing in some count