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Study: Hottest Oceans in 400 Years Endanger Great Barrier Reef

New research shows that water temperatures in and around Australia's Great Barrier Reef have risen to their warmest in 400 years over the past 10 years. The rising temperatures have put the world's largest reef under threat.

The Great Barrier Reef is the world's largest living ecosystem. It stretches for 2,400 kilometers off the coast of the northern state of Queensland.