Even with this, it's not fine, it's just that the power itself is coming from a better source -- though a massive amount of power is actually being used, it's just from a better source. So yes, Bitcoin is helping to increase pollution -- but it's nowhere near the amount that the largest polluters, cows and other livestock, put into the environment.

This is why other coins tout the ability to use less power though the only time this will matter is if bitcoin gains a global foothold.