# Kaya identity

The Kaya identity is an identity stating that the total emission level of the greenhouse gas carbon dioxide can be expressed as the product of four factors: human population, GDP per capita, energy intensity (per unit of GDP), and carbon intensity (emissions per unit of energy consumed).wikipedia
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### Emission intensity

carbon intensityemission factorcarbon-intensive
The Kaya identity is an identity stating that the total emission level of the greenhouse gas carbon dioxide can be expressed as the product of four factors: human population, GDP per capita, energy intensity (per unit of GDP), and carbon intensity (emissions per unit of energy consumed).
The interrelations of these variables is treated under the so-called Kaya identity.

### I = PAT

I=PATI PATI=PAT equation
It is a concrete form of the more general I = PAT equation relating factors that determine the level of human impact on climate.
It is similar in form to the Kaya identity which applies specifically to emissions of the greenhouse gas carbon dioxide.

### Carbon dioxide

CO 2 CO2carbon dioxide (CO 2 )
The Kaya identity is an identity stating that the total emission level of the greenhouse gas carbon dioxide can be expressed as the product of four factors: human population, GDP per capita, energy intensity (per unit of GDP), and carbon intensity (emissions per unit of energy consumed).

### Identity (mathematics)

identityidentitiesdefinition
The Kaya identity is an identity stating that the total emission level of the greenhouse gas carbon dioxide can be expressed as the product of four factors: human population, GDP per capita, energy intensity (per unit of GDP), and carbon intensity (emissions per unit of energy consumed).

### Greenhouse gas

greenhouse gasescarbon emissionsgreenhouse gas emissions
The Kaya identity is an identity stating that the total emission level of the greenhouse gas carbon dioxide can be expressed as the product of four factors: human population, GDP per capita, energy intensity (per unit of GDP), and carbon intensity (emissions per unit of energy consumed).

### World population

human populationglobal populationworld's population
The Kaya identity is an identity stating that the total emission level of the greenhouse gas carbon dioxide can be expressed as the product of four factors: human population, GDP per capita, energy intensity (per unit of GDP), and carbon intensity (emissions per unit of energy consumed).

### Per capita

per-capitaper-personcapita
The Kaya identity is an identity stating that the total emission level of the greenhouse gas carbon dioxide can be expressed as the product of four factors: human population, GDP per capita, energy intensity (per unit of GDP), and carbon intensity (emissions per unit of energy consumed).

### Energy intensity

energy-intensiveenergy intensive
The Kaya identity is an identity stating that the total emission level of the greenhouse gas carbon dioxide can be expressed as the product of four factors: human population, GDP per capita, energy intensity (per unit of GDP), and carbon intensity (emissions per unit of energy consumed).

### Human impact on the environment

anthropogenichuman activityhuman impacts
It is a concrete form of the more general I = PAT equation relating factors that determine the level of human impact on climate.

### Gross domestic product

GDPnominal GDPGDP (nominal)
The Kaya identity is an identity stating that the total emission level of the greenhouse gas carbon dioxide can be expressed as the product of four factors: human population, GDP per capita, energy intensity (per unit of GDP), and carbon intensity (emissions per unit of energy consumed).

### Lists of countries by GDP per capita

GDP per capitaper capita GDPGross Domestic Product per Capita

### Carbon footprint

carbon impactcarbon footprintsCarbon thumbprint

### Scenario

scenariossituationvignette
The Kaya identity plays a core role in the development of future emissions scenarios in the IPCC Special Report on Emissions Scenarios.

### Intergovernmental Panel on Climate Change

IPCCIntergovernmental Panel on Climate Change (IPCC)International Panel on Climate Change
The Kaya identity plays a core role in the development of future emissions scenarios in the IPCC Special Report on Emissions Scenarios.

### Special Report on Emissions Scenarios

SRESEmissions Scenariosemissions pathways
The Kaya identity plays a core role in the development of future emissions scenarios in the IPCC Special Report on Emissions Scenarios.

### Carbon cycle

carboncarbon cyclingglobal carbon cycle
The projected carbon emissions can drive carbon cycle and climate models to predict future CO 2 concentration and climate change.

### Climate model

climate modelsclimate modellingclimate modeling
The projected carbon emissions can drive carbon cycle and climate models to predict future CO 2 concentration and climate change.

### Global warming

climate changeglobal climate changeanthropogenic climate change
The projected carbon emissions can drive carbon cycle and climate models to predict future CO 2 concentration and climate change.

### Bill Gates

BillWilliam H. GatesGates
* Bill Gates used a form of the Identity, without attribution, at a TED Talk called Innovating to zero!.

### TED (conference)

TEDTEDxTED talk
* Bill Gates used a form of the Identity, without attribution, at a TED Talk called Innovating to zero!.

### ThinkProgress

Think ProgressAlyssa RosenbergThinkProgress.org
Writing in ThinkProgress, Joseph J. Romm disputed the validity of Gates' arguments, as well as clarifying the key idea behind the identity.

### Joe Romm

Joseph J. RommJoseph RommClimate Progress
Writing in ThinkProgress, Joseph J. Romm disputed the validity of Gates' arguments, as well as clarifying the key idea behind the identity.

### Mario Bunge

Bunge, MarioMario '''BungeM. Bunge
The Kaya identity and its applications in climate control policies has been criticized by Mario Bunge.

### Eco-efficiency

eco-efficientGreeneconomic and environmental efficiency

### Life-cycle assessment

life cycle assessmentlife cycle analysislife-cycle analysis