Underwater vision shows 'unprecedented' mass coral bleaching event in the Americas - video

A mass coral bleaching event has hit reefs in North America, Central America and the Caribbean. Scientists in the region have told Guardian Australia's environment reporter Graham Readfearn they have never seen anything like it before. The tragedy is unfolding early in the season and in areas not usually affected by coral bleaching, sparking fears it could become a global event? Subscribe to Guardian Australia on YouTube Continue reading...