# The Carbon Math Nobody Wanted to Audit

- slug: the-carbon-math-nobody-wanted-to-audit
- date: 2026-04-23
- category: Artificial Intelligence

When a customer switched one feature from GPT-4o to o3, carbon per API call jumped 40x. Nobody caught it until the CSRD export. That is the accountability gap as the EU AI Act disclosure deadline arrives — and nobody has agreed on how to measure.

---