rubeaua: it will be very sad to no longer see my family. but this school is the opportunity to save my parents. it's the only way i can help myself and others. reporter: now that climate change is threatening traditional livelihoods, the potential income has never been more important. the mtc training is rigorous, with a strong emphasis on discipline. sunday is the only day off. each week, rubeaua leaves the school on the hour-long boat ride to his home village. on the ocean side, waves are eroding the island's foundation. only the shore of the lagoon remains intact. mtc trainers drop him off. the family subsists on what nature provides. the government buys up copra or dried coconut meat, but yields have been sinking year after year. rising water temperatures and sea levels also have an effect on marine life. now when rubeaua's father goes fishing, he often only brings home seaweed. tabeia: everything is changing. we are catching fewer fish, regardless owhich kind. her sea life is also disappearing. and on land, we have erosion. water from