IEA/OCDE

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Energy efficiency improvements over the last 25 years saved a cumulative USD 5.7 trillion in energy expenditures ;  this virtual supply of energy generates multiple benefits for governments, businesses and households, including greater energy security from reduced dependence on energy imports and billions of tonnes of greenhouse gas emissions reductions ;this report evaluates the impact of energy efficiency in the energy system and assesses the scale and outlook for further energy efficiency investment using detailed country-by-country energy efficiency indicator data and IEA expertise.