The Kaya identity spelled out the math that let emissions keep rising
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The Kaya identity spelled out the math that let emissions keep rising
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The Kaya identity spelled out the math that let emissions keep rising
In this episode, we lay out the scene and show what the Kaya Identity measured, who built it, and which numbers moved - and did not - as emissions climbed. The episode asks why a perfectly clear accounting of drivers failed to stop the growth in global carbon dioxide.
Person: Yoichi Kaya
Date: 1993
Location: Tokyo
Topic: Kaya Identity (drivers of carbon emissions)
Event: Adoption by the IPCC
- Yoichi Kaya and Keiichi Yokobori published the identity in a book linking population, GDP per capita, energy intensity, and carbon intensity.
- The equation expresses total CO2 (F) as population × GDP-per-capita × energy-per-GDP × carbon-per-energy.
- IPCC adopted the Kaya framework for emissions scenarios, making it central to global projections.
- Between 1978 and 2018 carbon intensity fell ~13% and energy intensity also declined, yet total emissions rose.
- Global CO2 emissions rose from 18 billion tons (1978) to 33.7 billion tons (2018), an 87% increase.
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