Articles on Seawater

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A firefighting plane dumps water on one of the fires in the Los Angeles area in January 2025. Brian van der Brug / Los Angeles Times via Getty Images

Firefighting planes are dumping ocean water on the Los Angeles fires − why using saltwater is typically a last resort

In emergencies, dumping ocean water on fires may be the best option. But seawater can have long-term effects on equipment and ecosystems, as a novel coastal experiment shows.
In 2022, California built an emergency drought barrier across the West False River near Oakley to protect against saltwater intrusion. AP Photo/Terry Chea

What is seawater intrusion? A hydrogeologist explains the shifting balance between fresh and salt water at the coast

Saltwater intrusion is bad for human health, ecosystems, crops and infrastructure. Here’s how seawater can move inland, and why climate change is making this phenomenon more frequent and severe.
The Carlsbad Desalination Plant in Southern California is the largest such plant in the Western Hemisphere, providing 50 million gallons of desalinated seawater per day.​ Reed Kaestner via Getty Images

Desalinating seawater sounds easy, but there are cheaper and more sustainable ways to meet people’s water needs

Nearly 97% of the world’s water is in the oceans, but desalination is no magic bullet for water-stressed coastal cities.
Grant Elliott/Unsplash.

Curious Kids: why is the sea salty?

The salt in the sea has built up over billions of years – but it wouldn’t have got there without freshwater rivers and streams.

Seawater could be new fuel for navy ships

Seawater could be used to fuel naval ships, replacing the need for oil-based jet fuel. Using metal catalytic converters in…

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