Who owns the reliable information that the network bitcoin uses more than 80% of the countries separately electricity. Bitcoin also multiplied by several times the amount of energy consumed in the last year. Is this really true, who will say? So there are thoughts that bitcoin in a couple of years will be a threat to the energy situation on the planet?
Not really. I think bitcoin mining electricity cost doesn't spend that much. Now we have many ASIC miners for bitcoin. ASIC is more effective than GPU.
The energy consumption relative small if you compare with the very high hash rate in ASIC. So, i think the energy of the earth will be okay.