Cut the words “please” and “thank you” from your next ChatGPT query and, if you believe some of the talk online, you might think you are helping save the planet.

The idea sounds plausible because AI systems process text incrementally: longer prompts require slightly more computation and therefore use more energy. OpenAI’s chief executive Sam Altman has acknowledged it all adds to operating costs at the scale of billions of prompts.

At the same time, it is a stretch to suggest that treating ChatGPT politely comes at significant environmental cost. The effect of a few extra words is negligible compared with the energy required to operate the underlying data centre infrastructure.

What is more important, perhaps, is the persistence of the idea. It suggests that many people already sense AI is not as immaterial as it appears. That instinct is worth taking seriously.

Artificial intelligence depends on large data centres built around high-density computing infrastructure. These facilities draw substantial electricity, require continuous cooling, and are embedded in wider systems of energy supply, water and land use.

As AI use expands, so does this underlying footprint. The environmental question, then, is not how individual prompts are phrased, but how........

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