> You do realize just how small this co2 output is compared to the human co2 output it replaces.

Sure, the issue is that the scale of models is increasing by orders of magnitude in a fairly short span of years, as well as the range of applications rapidly expanding. It doesn't take long for that kind of growth to go from a trivial issue to catastrophic one, and it's the exact kind of risk you have ethicists in a field to call out while it still is trivial so that some of the energy of people doing technical development gets directed to mitigate the risk of it ever reaching the catastrophic stage.