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Coral Reefs
Coral bleaching affected 91% of reefs surveyed along the Great Barrier Reef this year, according to a new report by Australian government scientists.
Why it matters: The report confirms a sixth mass bleaching event since 1998 occurred at the world's largest coral reef ecosystem in March due to a heat wave driven by climate change. It's the fourth such event since 2016, notes the report, which warns climate change "remains the greatest threat" to the ecosystem.