Great Barrier Reef in fourth mass bleaching event since 2016
The world's largest coral reef, in Australia, is going through another bout of mass bleaching. It is mostly caused by heat stress, a problem that is worsening as our planet and oceans warm. Al Jazeera's @Katia Lopez Hoda-Yan has more. – Subscribe to our channel: http://aje.io/AJSubscribe – Follow us on Twitter: https://twitter.com/AJEnglish – Find us on Facebook: https://www.facebook.com/aljazeera – Check our website: https://www.aljazeera.com/ #AlJazeeraEnglish #GreatBarrierReef
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