Scientists can measure coral reef health by assessing the amount of calcium carbonate produced over time through shells and skeletons of marine animals on the ocean floor.
Over 700 organisations across the globe have urged the United Nations to establish an international treaty to address plastic pollution ahead of a bloc meeting.
The Florida Reef in the United States is threatened by a rapidly spreading disease that has a mortality rate of 66 to 100 percent. The disease has already begun its spread outside the US.
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