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A global oceans summit wrapped up Friday with world leaders taking major steps toward marine protection and vowing a showdown when nations meet to negotiate rules for deep-sea mining next month.

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Harnessing ocean currents to boost fuel efficiency of vessels, or tracking whales using sensor data and AI -- startups at Paris trade fair Vivatech have been showing off the latest innovations aimed at protecting the environment.

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A summit on the state of global oceans concludes Friday with nations having tested the waters on deep-sea mining and making strides towards protecting unpoliced reaches of the high seas.

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Archaeologists have discovered what they say are the remains of a 16th-century merchant ship more than 2.5 kilometres underwater off southern France, the deepest such find in its section of the Mediterranean or any other French waters.

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Global heating persisted as the new norm, with last month the second warmest May on record on land and in the oceans, according to the European Union's climate monitoring service.Â