I don't see a lot of difference in terms of ecological impact between making wood products with a CNC machine and making them with regular power tools. Of course, if you get more product out of your materials, for instance by nesting the parts you're cutting out, that would be a point for the CNC machine. But if you're running the CNC machine constantly but the other tools intermittantly, that power saved would be a point for the semi-hand-made method.
If you can use fewer workers by utilizing CNC technology, then you can't be blamed for the impact the workers you didn't hire have on the environment. And unemployed people probably drive less, and don't eat as much meat, so I suppose you could take credit for that, although it might not be a very popular claim to make right now...
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