ProofOfStake and Masternode protocals will rule!

*Is there another way? Aside from pushing for more efficient hardware, there are other "proof" techniques that are less demanding, though may introduce security concerns. Proof of stake is the frequently mooted solution which uses a less demanding system to prove ownership of coins and dole them out via a raffle-like scheme, Vranken says. There's also proof of space, which he explains sees the miner use a specified amount of memory to compute the proof. There's also proof-of-space-time, which adds in a temporal element, but at this point that sounds a bit like he's trolling us all.*

Source: http://www.wired.co.uk/article/how-much-energy-does-bitcoin-mining-really-use