Bitcoin is terrible for the environment – can it ever go green?

Cryptocurrency mining uses huge amounts of energy, but activists are urging for a change in its code to reduce its environmental impact

On the corner of New York's Park Avenue and 52nd Street, curious onlookers recently stopped in front of a giant green skull sitting in the bed of a truck parked outside the office of Fidelity Investments, the global financial management company.

The Skull of Satoshi", named after the pseudonymous bitcoin developer Satoshi Nakamoto, is composed almost entirely of computer circuit boards and fitted with tall smokestacks usually found atop coal power plants.