World Challenge is a global competition aimed at finding projects or small businesses from around the world that have shown enterprise and innovation at a grassroots level.
World Challenge is brought to you by BBC World News and Newsweek, in association with Shell and is about championing and rewarding projects and businesses which really make a difference.
Blue Ventures' project in Madagascar - home to both the world's fourth largest coral reef and a rejuvenated octopus fishing industry - is working with local communities to make sustainable livelihoods a reality.
Production by One Planet Pictures.
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