[00:00.000]The South Pacific is on the face of it， still a healthy ocean.
[00:04.409]We depend on it.
[00:05.628]Over 60% of the world's fish catch comes from the Pacific.
[00:09.824]But like all oceans, it has little or no protection,so it may not stay healthy much longer.
[00:16.864]So what's being done，one to preserve its natural treasures?
[00:20.364]And what does the future hold for this fragile paradise?
[00:24.938]For the South Pacific, this is a critical time.
[00:29.308]It's changing in ways that, if left unchecked,could develop into a global crisis.
[00:34.308]Some of its residents have been through crisis before.
[00:38.407]Humpback whales were hunted so relentlessly during the last century that their numbers crashed by 90%.
[00:45.403]But recently, they've made a comeback, surging from 5,000 to 60,000 animals.
[00:52.003]Their blubber is no longer boiled down，for oil.
[00:55.050]Today, these whales are greeted by boats loaded not with harpoons, but with tourists.
[01:01.124]The waters of Tonga are one of the few places in the world where it's legal to get in and meet the giants face to face.