My example assumed for the sake of simplicity that people starting bitcoin mining in A would drive up hash rate and thus difficulty enough to make mining unprofitable on the margin in some place B.
The electricity used for mining in B before can now either be used for something else, or the people in B can produce less electricity and save on resources.
Eg it used to be profitable to mine on your PC. Those days are long past: the returns don't cover the cost of electricity. Hence a shift away from that.
My example assumed for the sake of simplicity that people starting bitcoin mining in A would drive up hash rate and thus difficulty enough to make mining unprofitable on the margin in some place B.
The electricity used for mining in B before can now either be used for something else, or the people in B can produce less electricity and save on resources.