energy: how many economic units of GDP are produced by the consumption of units of energy. Referring to the above examples, 1 million Btus consumed with an energy intensity of 8,553 produced $116.92 of GDP for the US. Whereas, each million Btus of energy consumed in Bangladesh with an Energy Intensity of 2,113 produced $473 of GDP, or over four times the effective US rate. Russia, on the other hand, produced only $48.37 GDP per 1 million Btu based on an energy intensity of 20,676. Thus, Bangladesh could be perceived as having nearly ten times the economic energy efficiency of Russia. It is not directly causal that a high GDP per capita must have lower economic energy efficiencies. See the accompanying chart for examples based on the top 40 national economies. Energy intensity can be used as a comparative measure between countries; whereas the change in energy consumption required to raise GDP in a specific country over time is described as its energy elasticity. See also Emission intensity Energy use intensity Energy intensity by country List of energy storage power plants Overillumination World energy supply and consumption References data up to 2003 at EIA Energy intensity is a measure of energy efficiency of nation's GDP. General reference Energy Intensity (UN Department of Economic and Social Affairs) Energy economics Economic indicators