The #cryptocurrency #ethereum finally implemented a major network upgrade that completely changes how the $blockchain verifies transactions, mints new coins and secures its network. Called proof-of-stake, this system has reduced ethereum's #energy consumption by more than 99%. Energy usage has been one of the cryptocurrency industry's biggest targets for critique. But it's not likely that #bitcoin will follow suit. Find out why – and watch the full video on how the #crypto industry is trying to