Elon Musk, CEO of electric vehicle maker Tesla, said on Sunday that the US company will accept bitcoin payments again when the virtual currency is greener.  The American manufacturer caused a sensation in February when it announced that customers could pay in cryptocurrency, an option that became possible at the end of March.  But then Musk changed his mind, indicating that bitcoin were no longer accepted — in the interest of protecting the environment. “When there’s confirmation of reasonable (~50%) clean energy usage by miners with positive future trend, Tesla will resume allowing Bitcoin t…

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