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The IEA Energy Sector Carbon Intensity Index (ESCII) tracks how many tonnes of CO
₂ are emitted for each unit of energy supplied. It shows the global aggregate impact of changes in supply technologies over the past few decades. Under the ESCII, 100 represents CO
₂ intensity in 2010, providing a base to measure progress.
1990-2010 data from the IEA energy balances and CO
₂ emissions databases, for more data visit the statistics page.