>But by this logic nobody on the plane is responsible for any carbon emissions
That is strictly true. This is why the concept of a personal carbon footprint (something dreamed up by a British Petroleum marketing team) is inherently inane.
>Doubling that by doubling the block size (or, halving it by halving the block size) would be a meaningful change!
How and why? It would change your metric, but it wouldn't make the network consume one single watt less or more power. Its efficiency is unchanged.
A machine that spits out one widget per watt is less efficient than a machine that spits out 10 widgets per watt. Even if there is exactly one widget machine in the world, it is always turned on and always draws the same amount of energy, one type of machine would produce more widgets than the other. That machine is more efficient. It is more useful for the same energy input. It's a totally reasonable metric to compare widget-producing machines by!
If the bitcoin network is a transaction-producing machine, the more energy it takes to produce the same number of transactions, the less efficient it is. All else being equal, spending more money and energy for the same result is worse than spending less money and energy.
That is strictly true. This is why the concept of a personal carbon footprint (something dreamed up by a British Petroleum marketing team) is inherently inane.
>Doubling that by doubling the block size (or, halving it by halving the block size) would be a meaningful change!
How and why? It would change your metric, but it wouldn't make the network consume one single watt less or more power. Its efficiency is unchanged.