June 1, 2021 Cryptocurrencies are catching flak from environmentally conscientious investors who are claiming that the digital assets are “dirty currencies.” For example, one private equity company bought a decommissioned coal power plant, converted it to burn natural gas, and used it as a “power plant-cryptocurrency mining hybrid,” the Financial Times reports. Greenidge Generation Holdings stated that it expects to become “the only US publicly listed bitcoin mining operation with its own power source.” In a presentation to investors, the investment firm revealed says it mines Bitcoins for just $3,000. Climate activists, however, are dismayed that fossil fuels will be used to promote the mining of cryptocurrencies and are pushing regulators to begin cracking down.