China crackdown on cryptocurrencies turned the bitcoin world upside down last year, triggering a mass exodus of “miners” — who use powe… China crackdown on cryptocurrencies turned the bitcoin world upside down last year, triggering a mass exodus of “miners” — who use power-hungry computers to mine or create new bitcoins — to new places around the world. Now, research has found that the exodus likely made cryptomining, which already uses more electricity than many countries , even worse for the climate. According to the peer-reviewed study, which appears in the journal Joule, the Bitcoin network’s use of renewable energy…