I hope that in regards to Blockchain the POS system will win over the POW, because it is much more environmental friendly than any other consensus mechanism. Thats why I'm so bullish on Steem, EOS and Bitshares they are Blockchains that you can already use and don't waste a lot of energy!
RE: ‘Tsunami of data’ could consume one fifth of global electricity by 2025 | Environment | The Guardian