公開日:2022/01/09 / 最終更新日:2022/01/09

The price of tanked Wednesday after said Tesla will no longer accept the cryptocurrency, citing concerns about the use of fossil fuels for mining the coin.

CEO Musk tweeted Wednesday to say the electric car manufacturer ‘has suspended vehicle purchases using Bitcoin’. 

Creating Bitcoins and other cryptocurrencies requires a lot of electricity, releasing massive amounts of greenhouse gases. 

The cryptocurrency is ‘mined’ by high-powered computers that continuously solve computational math puzzles, the complexity of which means the processors require huge amounts of energy.With each solved problem, a certain amount of coin is produced.

While the machines use electricity, fossil fuel is a major category in electricity generation. 

Musk wrote: ‘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.’ 

Bitcoin, the world’s biggest digital currency, fell 15 per cent after the tweet. 

‘We are also looking at other cryptocurrencies that use <1% of bitcoin’s energy/transaction,’ Musk said.

Musk said in March Tesla customers can buy its electric vehicles with bitcoin, jumping up the price of the currency.

But on Wednesday he tweeted: ‘Cryptocurrency is a good idea on many levels and we believe it has a promising future, but this cannot come at great cost to the environment. 

‘Tesla will not be selling any Bitcoin and we intend to use it for transactions as soon as mining transitions to more sustainable energy.’ 

Tesla said in a February with the Securities and Exchange Commission (SEC) that it had bought $1.5 billion (£1.16 billion) worth of Bitcoin and would soon accept it as a form of payment for cars.   

Microsoft co-founder Bill Gates has already highlighted the negative impact mining Bitcoin has on the environment.’Bitcoin uses more electricity per transaction than any other method known to mankind,’ Gates said, ‘It’s not a great climate thing.’ 

A  published in Nature found huge farms of computers used to mine Bitcoin could produce enough greenhouse gases to raise global temperatures 3.6°F (2°C) in less than three decades. 

Studies have also shown that the annual carbon emissions from the electricity generated to mine and process the cryptocurrency is equal to the amount emitted by whole countries, including New Zealand and Argentina.   

Bitcoin mining’s energy consumption also eclipses that of the world’s major tech companies that provide entertainment services, including the streaming giant Netflix as well as Apple, Facebook, Microsoft and Google combined – all of which also require huge amounts of energy to run their services.

By comparison, Google – the largest energy consumer of the tech giants – used 10 TWh in 2019.On March 13, Bitcoin was using 130.9 TWh (annualized). The UK’s electricity consumption is slightly more than 300 TWh a year.       

Bitcoin, the world’s most popular cryptocurrency, was launched back in 2009.

It hit the headlines in 2017 after soaring from less than $1,000 in January (£815 at the time) to almost $20,000 in December (£15,000 at the time) of that year.

The virtual bubble then burst in subsequent days, with bitcoin’s value fluctuating wildly before sinking below $5,000 (£3,800) by October 2018.

However the last year’s rise has been more steady, with investors and Wall Street finance giants wooed by dizzying growth, the opportunity for profit and asset diversification, and a safe store of value to guard against inflation.

Bitcoin passed the $60,000 (£49,000) mark for the first time on March 13, reaching a record high of nearly $62,000 (£50,000).  

Major companies already accepting Bitcoin – like Microsoft, Wikipedia and AT&T – typically use specialist payment processors that convert the cryptocurrency into traditional currency and send the sum to the company. 

Bitcoins are traded via a decentralized registry system known as a blockchain, and found by so-called Bitcoin ‘miners’, who enable new Bitcoins to be created, but also to independently verify and record every transaction made with the currency.

More accurately, Bitcoins are the reward miners get for maintaining the transaction record accurately.

The mining works like a lottery that runs every ten minutes, with processing centers around the world racing to compile and submit this record of transactions in a way that is accepted by the system.

They also guess a random number, with the first to submit and record the correct number the winner of the prize, with this becoming the next block in the blockchain. 

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