Biodiversity losses from deep-sea mining are unavoidable and possibly irrevocable, an international team of scientists, economists and lawyers argue. They say the International Seabed Authority, which is responsible for regulating undersea mining in areas outside national jurisdictions, must recognize the risk and communicate it clearly to member states and the public to spur discussions as to whether deep-seabed mining should proceed, and if so, what safeguards are needed to minimize biodiversity loss.