More than a third of the coral in the northern and central parts of Australia's Great Barrier Reef is dead, say researchers. The damage is part of an event triggered by global warming and the El Nino weather phenomenon.
The Great Barrier Reef is worth 12 times more than the Sydney Opera House, at least according to a report commissioned by a charity protecting the natural wonder, hit by severe coral bleaching in recent years.
In some parts of Australia's much-loved reef, 70 percent of the coral has been killed by bleaching. Australia is pledging vast amounts of money to mitigate the loss and stop a UNESCO downgrade of its status.
Researchers in Australia are turning to cloud-brightening technology in a bid to save the Great Barrier Reef. But they warn it will only buy time, and we must reduce carbon emissions.
Coral bleaching is spreading south along the reef and can no longer be blamed solely on El Nino - scientists say the bleaching is linked to global warming. A recent aerial survey demonstrates the extent of the damage.
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