‘Madness’: World leaders call for deep-sea mining moratorium at UN ocean summit

This story was supported by the Pulitzer Center’s Ocean Reporting Network, where Elizabeth Claire Alberts is a fellow.

NICE, France — At the 2025 U.N. Ocean Conference (UNOC), taking place in Nice, France, between June 9 and 13, world leaders renewed their call for a global moratorium on deep-sea mining, an emerging industry that many experts say could seriously and irreversibly damage marine ecosystems.

At the opening plenary, French President Emmanuel Macron denounced deep-sea mining as “madness.” He described the prospective industry as a “predatory” activity that threatens to destroy the seabed and potentially release stored carbon. France was among the first countries to take a stand against deep-sea mining, calling for a ban in 2022.