[RosanaAnaDana]

You have to drive the 'stuff' to 'somewhere' to turn it into 'whatever'.

The stuff costs more in CO2 to drive to the place than you get from turning it into 'whatever'.

[YeGoblynQueenne]

But is this a general and inescapable rule?

[RosanaAnaDana]

I think that would be a very interesting question to try and address in a meta-analysis.