In the initial stages every invention creates problems of pollution but afterwards with advancement of technology we may control it.
Major problem is usage of Petro products which need quick replacement.
Leadership with strong positive attitude are trying and marching ahead in this direction.
All of us need to save energy , least usage of man made things will save earth environment. People need to be educated for simple natural living.
Just bitcoin can't be blamed fiat currency paper currency also affects environment due to trees cut for printing also electricity used for it.
The amount of energy required for a bitcoin transaction is rather abstract, but the power consumed by each bitcoin transaction can be spent by a single U.S. family for a week, which more or less pollutes the environment...