In over 30 years of improving production and logistical processes we learned that in, even as highly efficient remarked, companies often 25% of all efforts add no value to the product and/or service provided. In most cases this percentage varies from 35% up till 50%.
If these numbers are shocking, widening your current definition of efficiency to a truly holistic view of your total processes will probably provide similar numbers.
Every effort, no matter how (in)direct, consumes energy and/or raw materials.