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Why is there more than 20 million tons of gold in seawater but humans cannot exploit it?

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Why is there more than 20 million tons of gold in seawater but humans cannot exploit it? 8

Currently, there are many views that the ocean is full of gold, the problem is how to exploit it. For more than a century, scientists have worked hard to find ways to get gold from the ocean. The US National Oceanic and Atmospheric Administration (NOAA) said: `Each liter of average seawater contains about 13 billionths … Read more