It depends on how the electricity is generated. Electricity generated from solar, wind, hydroelectric power plant, nuclear and flare gases waste of petroleum refinery are all clean means of generating electricity and they can not affect the environment.

But just that many countries still uses unclean energy which are contributing to the climate change, most from goal and also gases from petroleum by-product powered engines and the likes. They are mostly used for other means of making money, not online on bitcoin miner, mostly used in companies for other means.

Clean energy can also be generated which is what the world should move towards, but most developing and underdeveloped nations are still 100% dependent on coal and petroleum engines while many developed nations also still highly dependent on these unclean energies.