There are so many pros and cons on this matter. Coupled with Elon Musk's tweets from time to time about his concern if the use of fossil fuels increases for the development of crypto currencies. From one source, it is said that Bitcoin is mined by computers in large data centers that consume energy, this opinion is then supported by various analyzes of Bitcoin mining that are not environmentally friendly. But keep in mind that this is just an opinion. And until now, there are still many people mining Bitcoin and even updating their devices as a means of support, definitely not without reason. So try to think more openly, look for deeper information.