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Large language models (LLMs) have a dirty secret: they require vast amounts of energy to train and run. What's more, it's still a bit of a mystery exactly how big these models' carbon footprints really are. AI startup Hugging Face believes it's come up with a new, better way to calculate that more precisely, by estimating emissions produced during the model's whole life cycle rather than just during training. It could be a step toward more realistic data from tech companies about the carbon footprint of their AI products at a time when experts are calling for the sector to do a better job of evaluating AI's environmental impact. Hugging Face's work is published in a non-peer-reviewed paper.