English: This graph shows changes in the components of the Kaya identity between 1971-2009. The graph shows changes in global energy-related carbon dioxide emissions between 1971-2009. Also plotted are changes in world population, world gross domestic product (GDP) per capita, energy intensity of world GDP, and carbon intensity of world energy use. GDP is measured using purchasing power parities. In the graph, energy intensity of GDP is labelled "TPES / GDP", where TPES stands for total primary energy supply. Carbon intensity of energy use is labelled "carbon dioxide emissions / TPES." This graph was produced using data from the publication: “CO₂ Emissions From Fuel Combustion: Highlights (2011 edition);” author: International Energy Agency (IEA); publisher: IEA, Paris, France. The IEA has made data from this publication freely available to download as an Excel (XLS) spreadsheet (1,008 KB).