https://apnews.com/e0074a2343a3e3a9beb08723ff65ecf5 > BERLIN, El Salvador (AP) — At a geothermal power plant near El Salvador’s Tecapa volcano, 300 computers whir inside a trailer as they make complex mathematical calculations day and night verifying transactions for the cryptocurrency bitcoin. > The pilot project has inspired a rash of volcano emojis from President Nayib Bukele, who made bitcoin legal tender in September, and promises of cheap, renewable energy for so-called bitcoin “mining.” Such operations, including ones industrial in scale, have been harshly criticized elsewhere in the world for the massive amounts of electricity they use and the resulting carbon footprint.