ETH is working on a different verification process which would bring down overall traffic. Lightning network would help in more transactions with less power used. But overall the manufacturers coming up with more efficient miners are key. Their manufacturing processes have to improve which is Moore's Law. The amount of power and space a calculator the size of a room was part of a generation still alive today. Just an opinion, Crypto shouldn't be the ones to solve energy crisis, but are a driving force.
RE: Crypto Update: Feb. 16, 2018