Like Electric Vehicles (EVs), Bitcoin is a fully electrified network, so it has no direct emissions. Like EVs, BTC has "indirect emissions" because some of that electricity was generated using fossil fuels. However ... also like EVs, each time someone uses it, rather than the old, more emission intensive technology it replaces (fossil fuel transport in the case of EVs, the more emission intensive banking network in the case of Bitcoin), it creates a net emission reduction. Here's a view we have comparing 2 net emission reducing technologies. In terms of usefulness, both are useful, just in different places and different ways. EVs help transport people in the West around, and are about convenience. Bitcoin's fastest adoption has been outside the West where it helps people transport and store money without high remittance fees, high inflation and the lack of a banking network - and is often about existential need.