US authorities are studying the impact of four mining companies on the environment

Amid the global crackdown on PoW cryptocurrency mining, the U.S. House of Representatives Committee on Energy and Commerce is looking into the energy and climate impacts of four major mining companies. As part of its oversight of the environmental and energy impact of blockchain, the agency sent letters to mining companies Core Scientific, Marathon Digital Holdings, Riot Blockchain, and Stronghold Digital Mining. The committee is asking what actions companies are taking to mitigate the environmental…