Moreover, on the cusp of the first cryptocurrency exchange execs testimony before Congress next week, Senator Elizabeth Warren had sent a letter to Greenidge Generation Holdings CEO Jeff Kirt demanding statistics on how Bitcoin mining affects climate change. This spells double trouble for miners as the regulatory scrutiny vise tightens over them with the looming digital asset regulations on one side, and the climate impact of Bitcoin mining on the other. This perfect storm might explain why Bitcoin mining giants like Marathon Digital or Riot Blockchain saw their share prices drop double digits on Friday.