Environmental advocate Join Cousteau hosting a Going Green : Oceans special . GMT joins team from Catlin Seaview Survey as they map Australia 's GMT . Watch Friday March 29 at 15:30 GMT ( 11:30 ET ) Philippe Cousteau for Twitter chat immediately after show # CousteauCNN .
Environmental advocate Philippe Cousteau hosting a Going Green : Oceans special . Cousteau joins team from Catlin Seaview Survey as they map Australia 's Great Barrier Reef . Watch Friday March 29 at 15:30 GMT ( 11:30 ET ) Join Cousteau for Twitter chat immediately after show # CousteauCNN .