This story is part of the Grist series Unearthed: The Mining Issue , which examines the global race to extract critical minerals for the clean energy transition.

Since ancient history, mining has been a dirty business. While we've developed new tools, chemicals, machines, and techniques, most of today's mining still boils down to digging in the dirt. As the world ramps up production of the technologies it needs to move away from fossil fuels, this widespread disturbance of Earth and ecosystems will continue in the accelerating search for critical minerals like lithium, cobalt, nickel, and rare-earth elements.

But what if there were another way? Or, better yet, many other ways. After all, the minerals we need aren't just buried underground. As the basic building blocks of much of the world's matter, these elements have accumulated everywhere: in plant life, in the ocean, in our industrial waste, and even in rocks hurtling through outer space. While the ability to pull enough minerals from these sources to power the energy transition is still a long way off, scientists and entrepreneurs are hard at work trying to find out if each of these sources can compete with traditional mining methods. In the process, they're also raising challenging questions about how far we'll need to stretch human ingenuity to meet the challenge of the energy transition — and just how clean even the most advanced type of "mining" can ever be.

Mining our water

For more than a century, eccentric scientists have dreamed of wringing precious metals from the Earth's most vast resource: its oceans. The seas contain millions to trillions of metric tons of gold, cobalt, and other elements, including 17,000 times more lithium than the world's terrestrial reserves. Unlike more controversial forms of deep-sea mining that require dredging the ocean floor, these dissolved minerals can be extracted directly from the ocean water itself.

In the 1920s, German chemist Fritz Haber hatched a plan to…

Grist staff

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