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Energy usage of LLMs used through an individual chat interface doesn't seem worrying to me. It's not worse than energy usage of a high-end PC, and it's limited by how much a human can ask and read.
But deployment of LLMs as "autonomous #agents seems like a floodgate for wasteful large-scale usage. It makes it easy to run lots of them, without time limits. Getting only summarized outputs hides how much effort was spent in the process of getting it.