They are right, we really shouldnt be worried about how much energy Bitcoin consumes.
Nah, I bet you really feel that way in the actaul world. The power consumption of your mining is a great factor to be considered because it is one of the biggest expenses can be deducted to your generated profit. If you will not worry for this then probably you get more losses than gains. It is okay to worry just only make sure to think a solution for that

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Well, I will also like to add that as a miner, if youre going to be making use of the energy supply from the government or whatever, you have to be worried about bills.
For those who are sick of that then why don't you try to build your own renewable power system. One of the easiest way to build is by using solar panels, it is eco friendly and take note, it doesn't need to change the topography of the environment which means that the natural environmental habitat was conserved.