The blockchain technology has made the transactions and the exchange easier without the need of a middleman. It uses the source of hydro power, as mentioned in the post which is indeed an ecofriendly means of a resource. It eliminates the means of a fuel based resource. Given that it is an online based resource, it is good for the environment.
Even in future we are expecting that it will become more and more popular and more easy for the people to use. I think that it is totally environmental friendly, i cannot see any bad effect of bitcoin on our society, but it will really help the people to increase their income. Bitcoin has already given a lot of profit to people, people have make a good profit from bitcoin investment and still they are confident to get more an more profit by continuing their investment in bitcoin.