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Here's how the steel industry impacts phytoplankton in the North Pacific

Ryan Tabata
Rosette water sampler prepped for deployment during the Gradients Cruise onboard the R/V Kilo Moana.

The United Nations Ocean Conference kicked off in France this week, with scientists watching to see if the international community would ratify a treaty to protect the open ocean.

Fifty countries have signed onto the High Seas Treaty — 60 are needed for the first legally binding agreement protecting marine life in international waters to take effect.

The U.S. has not ratified the treaty.

A region of international importance that would fall under the treaty is the North Pacific Transition Zone, a patch of ocean north of Hawaiʻi that hosts fish and other aquatic species.

New research from the University of Hawaiʻi at Mānoa reveals that pollution from the steel industry has affected this region’s delicate ecosystem.

Nick Hawco is an assistant professor of oceanography at UH Mānoa who led the research. He spoke with The Conversation about his team’s work.


This story aired on The Conversation on June 12, 2025. The Conversation airs weekdays at 11 a.m.

Maddie Bender is the executive producer of The Conversation. She also provided production assistance on HPR's "This Is Our Hawaiʻi" podcast. Contact her at mbender@hawaiipublicradio.org.
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