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>> the fourth nominee is based on the indian ocean island of madagascar, home to one of the biggest and most important coral reefs in the world. marine biologist alastaire harris first came here on a college funded expedition. >> so much of what we see here is disappearing in front of our eyes. >> when he first did a survey of the reef as part of his studies, he realized that overfishing and climate change were slowly killing it and threatening the survival of the local people. >> conservation here for these people, it's about the bottom line. it's about a future for their kids. >> alastaire's...

>> alastaire's breakthrough came when he persuaded just one village to close a small area of the reef to fishing for six months. when it's reopened, he encouraged them to use only sustainable fishing techniques for catching their main target, octopus, their single most important source of income. the results were staggering. >> people before the closure were catching up to weight of 300 grams. after closure, they're catching weight up to 7 kilos. there's a real pulse of revenue coming into these villages. >> today, the reef is teeming with life again, and the project has gone viral. >> hundred...

Months. when it reopened, he encouraged them to use only sustainable fishing techniques for changing their main target, october put, the single most important source of income. the results was staggering. >> people before the closure were catching october put that weighed on average about 300 grams. after a closure, they're octopus that weigh up to seven key lows. there's a real pulse of revenue coming into these villages. >> today, the reef is teeming with life again and the project has gone viral. >> there are over hundreds of kilometers of this coastline, groups of villages are now working ...

When it reopened, he encouraged them to use only sustainable fishing techniques for catching their main target, octopus, the single most important source of income. the results was staggering. >> people before the closure were catching october put that weighed on average about 300 grams. after a closure, they're catching octopus that weigh up to seven kilos. so there's a real pulse of revenue coming into these villages. >> today, the reef is teeming with life again, and the project has gone viral. >> there are over hundreds of kilometers of this coastline, groups of villages are now working to...

When it reopened, he encouraged them to use only sustainable fishing techniques for changing their main target, octopus, the single most important source of income. the results was staggering. >> people before the closure were catching octopus that weighed on average about 300 grams. after a closure, they're catching octopus that weigh up to seven kilos. there's a real pulse of revenue coming into these villages. >> today, the reef is teeming with life again and the project has gone viral. >> there are over hundreds of kilometers of this coastline, groups of villages are now working together t...