Elon Musk may have the world’s most popular cryptocurrencies wrapped around his finger, but one of his many market-moving tweets this year highlighted a growing concern about the virtual currency.

In March, the Tesla chief said the electric car maker would accept payments in Bitcoin from US customers, one month after announcing it had bought US$1.5 billion ($2 billion) of the currency.

Just weeks later, Musk abruptly walked back the decision, citing emissions from energy used by miners trying to grow their own pot of the world’s biggest cryptocurrency.

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