Relevant info is at the end of the article :
"The electricity used for Bitcoin produces about 22 megatons of CO2 annually, a study in the scientific journal Joule estimated. That is as much as Kansas City in the US."
Bitcoin = Kansas City
"The electricity used for Bitcoin produces about 22 megatons of CO2 annually, a study in the scientific journal Joule estimated. That is as much as Kansas City in the US."
Bitcoin = Kansas City