Nothing has soured me more on bitcoin than its impact on the environment. If for no other reason than that, I'm done with it.

I mean I hear ya but it seems a little bias when they are 'projecting'. I mean, if I had 0 wives last week, got married this week, does that mean in 2 months i'll have 8 wives? (no i am not in UT)

"Here we show that projected Bitcoin usage, should it follow the rate of adoption of other broadly adopted technologies"

Even today bitcoin is a serious energy concern. Currently the network uses as much energy as Denmark, while commanding a 0.033% share of cashless transactions. Which countries will bitcoin surpass in energy usage in 2019 as mining gets exponentially more difficult by design?