The energy consumed per transaction to produce the PoW to earn the block subsidy decreases as the number of transactions increases, because the two are independ

The energy consumed per transaction to produce the PoW to earn the block subsidy decreases as the number of transactions increases, because the two are independent of each other, with rising transaction volumes not increasing the block subsidy and the associated energy consumed to earn it. Moreover, the energy consumed per transaction to produce the PoW to earn the transaction fee decreases when the transaction fee decreases. So for both of these reasons, a cryptocurrency like Bitcoin Cash, that can process thousands of times more transactions than Bitcoin, has the potential to be orders of magnitude more energy efficient.