I think our main problem is the huge electricity expense induced by mining and its noxious effect on the climate. This is, to my mind, the only serious argument against Bitcoin.
I think mining cryptocurrency activity is still not comparable with carbon monoxide gas from motor vehicles, greenhouse effect, forest destruction, industrial electricity usage etc.
I highly support this assertion. The extent of pollution caused by motor vehicles and other carbon monoxide emitted gadgets can never be compared to mining of cryptocurrencies. Although mining has some noxious effect on the climate, the most cause of global warming has not been bitcoin mining.