+**Energy efficiency** is the art of achieving desired outcomes with less [Energy](/wiki/energy) input. It means reducing [Waste](/wiki/waste) and maximizing utility from every unit of power, a key element for [Sustainability](/wiki/sustainability). This practice conserves resources and lessens environmental impact.
+## See also
+- [Renewable Energy](/wiki/renewable_energy)
+- [Green Building](/wiki/green_building)
+- [Climate Change](/wiki/climate_change)