Tesla CEO and self-dubbed Technoking is back-pedaling on the company’s stance about bitcoin and has suspended purchases of its electric vehicles with the cryptocurrency.

The change of stance, which was delivered via tweet, comes just weeks after Tesla CFO and dubbed “Master of Coin” Zach Kirkhorn said the company believes in the longevity of bitcoin, despite its volatility. The tweet from Musk sent the price of bitcoin down more than 4% (and falling). The price of bitcoin is down more than 7% for the day, although some of that decrease occurred prior to Musk’s tweet:

Tesla has suspended vehicle purchases using Bitcoin. 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.

Cryptocurrency is a good idea on many levels and we believe it has a promising future, but this cannot come at a 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. We are also looking at other cryptocurrencies that use