I recently watched the above documentary that dealt with how the warming of the oceans is killing off the coral reefs all over the world. The filmmakers developed time-lapse cameras that they could place on the ocean floor to show how when temperatures rise even slightly, first the reefs get bleached white and then develop brown fibrous attachments all over them, giving them the look of ghostly apparitions. They focus a lot on the Great Barrier Reef in Australia.
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