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Bitcoin crossed $ 30,000 as Elon Musk said Tesla was "very likely " to start trading again 'accept as payment.
The electric car maker said in May that it would no longer accept cryptocurrency for purchases.
He had cited concerns about the environmental impact of thBitcoin mining that uses huge amounts of electricity.
This move came less than two months after the business You started accepting the world's largest digital currency as a medium payment.
"Most likely the answer is that Tesla would start accepting Bitcoin again " Mr. Musk said at the B Word cryptocurrency conference.
He also stated that he had investigated the use of fossil fuels in Bitcoin mining: "I wanted a little more due diligence to confirm that the percentage of energy use renewable is most likely equal to or greater than 50%, and that there is a tendency for that number to increase, and if so, Tesla would start accepting Bitcoin again. "
Some Tesla investors and environmentalists attacked Tesla's decision earlier this year to start accept Bitcoin as a form of payment.
The dispute has brought to light the problem of purchasing electric vehicles considered environmentally friendly using cryptocurrency Energy intensive.
Since Bitcoin mining uses large amounts of electricity, concerns have been raised as to whether the energy comes from fossil fuels or renewable sources.
Mr. Musk has also been criticized for using his popularity and position as one of the richest people in the world to support cryptocurrencies.
During his appearance at the B Word conference, Mr. Musk has declare that, along with the Bitcoin owned by Tesla and his rocket company SpaceX, he personally owned Bitcoin and the cryptocurrencies Ethereum and Dogecoin.
He also responded to claims that he helped to artificially increase the price of cryptocurrencies before selling them: "I could pump, but I am not emptying ... I certainly do not believe in the idea of raising the price and selling ... I would love to see Bitcoin succeed. "
Other speakers at the B Word conference included Jack Dorsey, CEO of Twitter, and Cathie Wood, director of ARK Investment Management.
Following his comments, Bitcoin rose 6% to $ 31,952 and Ethereum rose 10.6% more to $ 1,979, according to data from the Coindesk website.
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