Bitcoin can only go Green by dropping the Proof of Work and moving to an alternative such as Proof of Stake.
The PoW miners have centralized control of bitcoin thru their PoW Mining Equipment, giving that up would give up their control.
They will never do it.
If you want energy efficiency, look into the alts as bitcoin is dead in the water on ever fixing their energy waste problem.
Sir i just got your words, but in case of PoS the New block is found through a deterministic way ( i read in google) , and it depends upon the stake and records. Does it mean the pool with maximum hashing power will find the block faster ?
In Proof of Stake,
The larger the number of coins per block the better your chance to stake.
Some calculate a coin weight = # of coin * days since last staked
(Their are multiple implementations with varying specs.)Big Difference
in PoW your ASICS can try and mine every block,
in PoS your coins go inactive for a defined period of time after the stake
(varies with different coins) This keeps a Proof of Stake Majority Coin Holder from dominating the block generation unlike a Majority Proof of Work Miner that could dominate a PoW network constantly.
Pooling is not as important in Proof of Stake as Proof of Work.
In some Proof of Stake coins it helps and in others no real difference , just depends on their specs.
* In Proof of Stake the blocks creation difficulty increases if the blocks are being found too fast, and decreases if the blocks are not being found fast enough,
so pooling can't make more blocks be found than the daily limit set in the program code.*