otherwise we wouldn't be able to protect our resources, and produce excellent milk -- mimik that tastes of southern chile. reporter: right now she's looking out for the next geneneration on her r farm. these heififers should s start producing milk in about one year's time. host: australilia's greaeat bar reef is s a breathtakiking natl treasure of immense beauty and diversity -- but it is under threat. in fact, it may be dying a slow death. coral bleaching events are becoming more frequeuent, leavg behihind devastation. in many places, the colorful underwater world has turned into a graveyard. repoporter: this h has got to be of theorldld's bt locacatis for a univertyty lectu. and ththesresearchchs, students and d assistants, , clad in bk wewetsuits, are e about to geo wowork. here, on lizizard island, , the invevestigating the underwater world of the great barrier reee. drdr. anne hoggegett has liven lizard islanand for 27 yeaears. no one knows the reef aselell as she e does and e's dedeep concerned. . . hoggt: thehelimate scientis w who a forecasting wh is gogointo happepein the comin