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by rgsteele 4821 days ago
The Bitcoin FAQ does address the issue, albeit briefly:

https://en.bitcoin.it/wiki/FAQ#Is_it_not_a_waste_of_energy.3...

Bitcoins have value because they are useful and they are scarce. In order to keep them scarce, there must be some mechanism to keep supply and demand in balance.

If you can come up with a method for maintaining this balance which requires a lesser expenditure of energy, you could argue that a currency based on it would be more environmentally responsible. I suspect, however, that such a method does not exist. At least, I can't think of one. Can you?