I guess the title should be: Bitcoin Helps Global warming.
As far as we know, cryptocurrency mining releases a lot of heat. all this heat together will certainly have a negative impact over time... So, logically, mining is an added dose to the whole global warming problem
no, again: Bitcoin Mining will in the long-term only be worthwhile where the waste-heat can be used. And you will only mine only to use the waste-heat, not 24/7, and not for profit, but only to get some crypto-coins back for your energy bill.
PS: Fiat currencies are backed by proof-of-force through the military-industrial-oil-big-finance-complex which directly and indirectly accounts for probably more than 50% the world's energy consumption.