An interesting question just popped in my mind:
How much kWh was used to create the current Blockchain?
Should be somehow possible to calculate it based on the given mining hardware and mining difficulty.
From inception or for each new block?
Purely from a scientific point of view. And from inception, thus the genesis block.
Would be nice to see(feel) the monumental work and energy that was put to secure the blockchain and to get an impression and a feel of how much power was used to create this distributed ledger.