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The 1998 event saw Indian Ocean surface temperatures rise to unprecedented levels, killing off - or "bleaching" - more than 90% of the inner Seychelles coral. Coral bleaching has been described as a vivid demonstration of climate change in action.

Worldwide, coral reefs cover an estimated 284,300 sq km and support over 25% of all known marine species.

http://news.bbc.co.uk/2/hi/science/nature/4772715.stm
セイシェルでは1998年の珊瑚の白化現象から立ち直っていないらしい