Earlier quoted context omitted.
>Besides, we have a lot of limestone, veritable rock-oceans of it. Sure but the amount of carbon you burn to get to that rock, excavate it, process it, move it, etc, etc is non-trivial. A computer and projector on 8 hours of day is a drop in a bucket to that.
Yeah but in order to manufacture that computer and projector you needed vast amounts of energy, water, minerals, plastics, rare earths, compounds that don't exist naturally in our planet, pollution disposal, such as heavy metal contamination & arsenic compounds, waste acid, strong bases. In fact the cost things like PECVD or dry etching is so disproportionate compared to drilling a hole in the ground, that I'm willin…
>that I'm willing to bet a computer is the equivalent of hundreds of years worth of a blackboard with chalk.
As someone who grew up near a limestone mine, I think you greatly underestimate how much work it takes to get rocks from the earth. I've seen some of the largest machines in the world working there. Its an huge operation.