Norfolk Island’s unique corals under triple threat from disease, El Niño and now government-approved dredging

Exclusive: Most of the island’s corals are likely to be species that have not been formally described by science, researcher says

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Scientists fear unique corals that fringe Australia’s remote Norfolk Island could disappear because of a triple threat of disease, El Niño and a federal government plan to dredge a neighbouring shipping channel.

A failure to manage sediment and pollution washing into bays from cattle farming, cleared land along with wastewater has been blamed for widespread disease and outbreaks of algae over the corals.