I just stumbled upon this article that claims Bitcoin could be consuming as much energy as Denmark by 2020 
Since I gave up mining in 2014, I've almost forgotten just how much electricity goes into making Bitcoins. This got me wondering whether the devs are already working on a solution to this problem. Anyone knows what the plan is?
http://inhabitat.com/power-hungry-bitcoin-could-consume-as-much-energy-as-denmark-by-2020/
Since I gave up mining in 2014, I've almost forgotten just how much electricity goes into making Bitcoins. This got me wondering whether the devs are already working on a solution to this problem. Anyone knows what the plan is?http://inhabitat.com/power-hungry-bitcoin-could-consume-as-much-energy-as-denmark-by-2020/
I think in the future you will no bitcoin mining tools are more sophisticated and power-saving course. Because of the growing popularity of bitcoin there will be more innovations to develop mining hardware, and of course in 2020 you will use less electricity to mining
hehe Just my opinion, Thank you