Can crypto go green? Major companies are trying — but it's easier said than done - CNBC

The whole process behind cryptocurrency mining is underpinned by something known as "proof of work." And it uses up an incredibly large amount of energy.

BODEN, Sweden Tucked away in snowy Swedish Lapland is a modern-day gold mine. But instead of picks and shovels, it's filled with thousands of computers. These machines, known as mining rigs, are wor… [+4850 chars]

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