I should imagine estimates of carbon footprint for given components are, at best, fairly "handwaving" and uncertain. So attempts to break things down by family of microcontroller will probably not achieve much (other than contributing to carbon footprint due to the time it takes to gather and process the information).
And once one gets to the *use* of components, over their lifetime, that is well outside the control and knowledge of ST.
I suppose once could argue that e.g. a Triac, which can switch a lot of power, will control much more power over its useful life than it took to manufacture. But the triac might be controlling power extremely efficiently so it does not necessarily mean it dissipates (wastes) a lot of power in its use.
Whereas something that is internally extremely complicated but burns very little power in use such as a stm32L5, will take proportionally much more power for production when compared to the power involved in its use.
Hope this helps,
Danish
