[proofofmoon]

O(n) total world energy expenditure on Bitcoin scales to O(1) transactions, so it currently only gets worse as more energy is poured into the system for the same transaction output.

There's a few solutions proposed:

- off-chain transactions (Lightning Network) - unknown complexity

- increased block size (Bitcoin Cash) - O(n) -> some larger O(1)

- a different consensus system (proof of stake blockchain, distributed proof of stake blockchain, Tangle, etc.) - varies

It's possible that the Bitcoin ecosystem will adopt one of these solutions in the future, but there doesn't appear to be a silver bullet right now.