Hottest ocean temperatures in 400 years an 'existential threat' to the Great Barrier Reef, report finds

Researchers say coral analysis shows recent extreme temperatures would not have happened without greenhouse gas emissions from fossil fuelsGet our morning and afternoon news emails, free app or daily news podcastOcean temperatures in the Great Barrier Reef are now the hottest in at least 400 years and are an "existential threat" to the planet's unique natural wonder, according to new scientific research.Scientists analysed long-lived corals in and around the reef that keep a record of temperature hidden in their skeleton and matched them to modern observations.Sign up for Guardian Australia's free morning and afternoon email newsletters for your daily news roundup Continue reading...