Elon Musk tweeted that Tesla will not accept payments in Bitcoin due to environmental concerns.
He also tweeted that he is working with Dogecoin developers to improve transaction efficiency.
Bitcoin's value hit a two-month low after Musk's statement, while Dogecoin rallied by 20%.
Musk has shown more support for Dogecoin than for Bitcoin in recent months.
Tesla suspended vehicle purchases using Bitcoin due to concerns about fossil fuel use in mining and transactions.
Musk believes in crypto but is against a massive increase in fossil fuel use, especially coal.
Twitter users welcomed Musk's statement and expressed support for Dogecoin.
Musk has previously suggested that crypto could become the world's future currency.
Bitcoin's value has stabilized since Musk's tweets.
Musk's tweets demonstrate his influence on the digital currency market.

Test your knowledge of Elon Musk's impact on the cryptocurrency market with this quiz! From his tweets about Bitcoin and Dogecoin to his views on environmental concerns, see how well you know the Tesla CEO's stance on digital currency. Keywords: Elon Musk, cryptocurrency, Bitcoin, Dogecoin, environmental concerns, Tesla, fossil fuel use, mining, transactions, future currency.