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What is the difference between energy conservation and energy efficiency?

Energy conservation and energy efficiency both mean using less energy, but energy conservation refers to any behavior that results in not using energy at all, such as turning off the lights when leaving a room. 

Energy efficiency is a technological approach to using less energy—requiring less energy to perform the same function.  In this case, less energy is used and it lasts longer.  An example is a compact fluorescent light bulb that will use less energy to illuminate a room.