I think they were looking for the amount of CO2 realesed during the mining, manufacturing and distribution of the CPU chip.

I wonder if that could just be extrapolated from cost to make silicon wafer of required grade. Surely the amount of chemicals and power used would be similar per mm2 of silicon processed, regardless of whether it is big CPU or a bunch of smaller chips.

Sure the machines will be more expensive but they are amortized over decades of production