The point isn't "this is how much CO2 google and bitcoin produce" but rather using the metric of CO2 footprint as a proxy for energy consumption to compare Bitcoin to Google to Facebook.
Whatever Bitcoin's CO2 footprint is, overall Bitcoin is consuming about 45x more power than Google over the course of a year.
Both Google (and Bitcoin) are optimizing for lower electrical costs - wherever that may be. Often this is associated with grids with hydroelectric power. Places like https://www.google.com/about/datacenters/locations/the-dalle...
The point isn't "this is how much CO2 google and bitcoin produce" but rather using the metric of CO2 footprint as a proxy for energy consumption to compare Bitcoin to Google to Facebook.
Whatever Bitcoin's CO2 footprint is, overall Bitcoin is consuming about 45x more power than Google over the course of a year.