Hottest oceans in 400 years making Great Barrier Reef 'increasingly vulnerable', scientists say

Ocean temperatures in and around Australia's spectacular Great Barrier Reef have risen to their warmest in 400 years over the past decade, according to a major report published in the journal Nature on Wednesday, making the world's largest coral reef system "increasingly vulnerable". The report's researchers said that human-induced climate change was most likely responsible for the warmer waters.