Several proof-of-stake cryptocurrencies have increased in price since Elon Musk backtracked on Bitcoin two days ago. In a tweet earlier this week, Musk announced that Tesla had suspended vehicle purchases made in 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,” he said. Since that tweet, the Tesla CEO doubled down, saying that it is “high time for a carbon tax,” and that while he strongly believes in crypto, “it can’t drive a massive increase in fossil fuel use.” His U-turn on Bitcoin caused its ... (full story)