The Kaya equation
What if a simple identity about climate said it all ?
Developed by Japanese economist Yoichi Kaya, the Kaya Equation breaks global CO₂ emissions into four forces: population, wealth per person, energy use, and carbon intensity. Its logic is relentless: as long as humanity grows richer, more numerous, and more energy-hungry, emissions cannot fall without a radical shift away from carbon.
From France’s low-carbon electricity mix but high consumption footprint to China’s massive emissions and the world’s rising population, the equation turns climate change from a moral debate into a strategic calculation.
It forces an uncomfortable question: can human development and planetary limits truly be reconciled — or must we rethink prosperity itself?
Paul Corey