I agree with you that it's a very unsignificant amount. BUT, mining is still very silly and non productive.
It produces bitcoins. And, it is necessary to process transactions in a manner which assures they are not corrupt. Next time you are at the stop light in your car, don't stomp on the accelerator. This will save more energy than if we all ran heavy miners in our house. Quit listening to green fools who can add.