Using an LLM for half an hour is about 0.005kg CO2 with a dirty coal electrical grid
And if use of the LLM were the biggest part of its electric cost, this would almost be a fair point (only almost, because there are things that go into that electricity use that are likely not being factored in, but that's not really the main point).
But regular use is not the biggest problem. Training models consumes massive amounts of electricity. And AI companies are constantly training new models to improve their performance.
And the only reason they need to keep training new models is because people keep using them.
"Using AI barely uses any electricity" isn't a reasonable argument, because it obscures the fact that AI companies are using massive amounts of electricity.