Australia downgrades outlook for Great Barrier Reef to 'very poor'

The long-term outlook for Australia's Great Barrier Reef was downgraded to "very poor" for the first time Friday by the official agency charged with managing the world heritage site.

In its latest five-yearly report on the health of the world's largest coral reef, the Great Barrier Reef Marine Park Authority singled out rising sea temperatures due to climate change as the biggest threat to the giant organism.