– Ricardo Navarro, El Salvadoran ecologist and head of the country’s Center of Appropriate Technology (CESTA), on President Nayib Bukele’s plans for a “Bitcoin City” powered by volcanoes. “Geothermal still costs more than oil, otherwise we would already be using more of it,” Navarro notes. Geothermal energy also needs steam and groundwater, Navarro adds, “but we already have problems with not enough water in El Salvador.”