The quantity of electrical power and poer th netork requires for mining is unsustainable and environmentally insensitive. Thwewan be a drawback with all of POW systems in general.sc i
This is just exaggerated, bitcoin consumes less energy than the normal process of minting coins and dollars and a lot less than the process of extracting gold from the deeps of the earth, that does not mean bitcoin does not consume a significant amount of energy but do not fall for it that is just propaganda to make it look as if bitcoin is not safe for the environment.