Daily Cuts - Great Barrier Reef - another mass bleaching event

Australia’s Great Barrier Reef suffers its worst bleaching ever. It’s estimated that 90 percent could be gone by 2050 if global temperatures rise by 1.5 degrees Celsius - a best case scenario. Joel Chua and Susan Ng find out why this is raising fears for other coral reefs around the world with Ove Hoegh - Guldberg, Professor, School of the Environment, Faculty of Science, University of Queensland