Based on carbon budgets from Lamboll et al https://www.nature.com/articles/s41558-023-01848-5 - updated to January 2025, the global rate for cutting CO2 inline with a 50% chance of not exceeding 1.5°C is ~19% year on year. For "well below 2°C" its ~7% each year; i.e. a technology revolution AND profound social change.

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