Elon Musk wants clean power, but Tesla's dealing in environmentally dirty bitcoin

Tesla boss Elon Musk is a poster child of low-carbon technology. Yet the electric carmaker's backing of bitcoin this week could turbocharge global use of a currency that's estimated to cause more pollution than a small country every year. Tesla revealed on Monday it had bought $1.5 billion of bitcoin and would soon accept it as payment for cars, sending the price of the cryptocurrency though the roof.
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