but sir of our oceans is under threat. but sir david has not lost hope. look how many whale species have come back from the brink of extinction, he says. the message is that it can be done the message is that it can be done the the message is that it can be done. the message is this is possible. done. the message is this is possible, the message is that the natural world has more resources than we can possibly imagine resources than we can possibly imagine. we ve worked out how to kiii imagine. we ve worked out how to kill them. imagine. we ve worked out how to killthem. now imagine. we ve worked out how to kill them. now we should give to kill them. now we should give them a chance for them to come give them a chance for them to come back give them a chance for them to come back and save themselves and save come back and save themselves and save us. a and save us. characteristically rousing call to action from the sir david, just weeks before he celebrates his 96th bi