You are wrong because most of mining operations take place in China, near hydroelectric dams. So mining does not produce all that CO2, because this is a somehow " clean " energy source.
Also, you can think of Bitcoin energy consumption in a different way
I believe that Bitcoin
can hasten the adoption of renewable energy sources.
Bitcoin can become a sponsor of solar energy. As cryptomining is profitable, people could buy solar panels and use the excess energy produced to mining operations, as they require a high amount of electricity and solar panels produce more energy than a single house consumes.
Bitcoin mining can be an environmental subsidy to alternative energy all around the world because it's causing these projects to be amortized over a year instead of five.
It's very easy to criticize bitcoin mining because it's too obvious. More obvious than the energy consumption of Visa, for example, which not everyone is aware of how much energy they consume.
More information about here:
https://www.youtube.com/watch?v=2T0OUIW89II (Andreas Antonopoulos.)
That are claims that Christmas lights consumes as much energy as bitcoin mining.
http://www.coindaily.co/2017/12/14/christmas-decorations-consume-as-much-electricity-as-bitcoin-mining/