San Francisco (AFP) – Tesla hit the brakes Wednesday on letting people pay for electric cars with bitcoin, saying the computing-intense mining process of creating new cryptocurrency spews climate-harming emissions. “We are concerned about rapidly increasing use of fossil fuels for bitcoin mining and transactions, especially coal, which has the worst emissions of any fuel,” Tesla chief executive Elon Musk said in a tweet. “Cryptocurrency is a good idea on many levels and we believe it has a promising future, but this can not come at great cost to the environment.” Mining bitcoin has become a co…

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