Australian officials will need to reverse their longstanding ban on offshore sand-mining in order to prevent the complete erosion of Sydney's golden beaches, a study suggests. Researchers have called for a $684 million, 50-year project to dredge sand from the seabed and dump it closer to shore, where waves will push it up onto the beach. The process, known as beach nourishment, has been carried out with success at other Australian sites using estuary sand, but researchers say the sheer scale of the Sydney project would necessitate using offshore sand.

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