Mass bleaching of coral reefs caused by climate change and warming oceans, scientists say

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Bleaching occurs when stressed coral expels the algae that gives them their colour when eaten. If it occurs for long enough, coral can die.

Coral reefs around the world are experiencing global bleaching as a result of warming oceans and human-caused climate change, top scientists have said. From February 2023 until now, coral reef bleaching has been confirmed across at least 53 countries, territories or local economies triggering the fourth global bleaching event, the National Oceanic and Atmospheric Administration and International Coral Reef Initiative said.

The last mass bleaching event ended in March 2017. It lasted three years - with two other bleaching events occurring in 2010 and 1998. Although bleaching is nothing new, for it to be declared on a global scale, significant levels of bleaching had to be documented within each of the major ocean basins, including the Atlantic, Pacific and Indian oceans in both the northern and southern hemispheres.

 

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Lab-grown coral could save the vibrant ocean landscapeReefs are ecologically extremely valuable but have been deteriorating due to mass bleaching events, climate change and over fishing.
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