Nearly all everyday products have an impact in terms of energy, especially when you consider their energy requirements across the whole life-cycle: production, use and end-of-life.
Eriti tuleks silmas pidada seda, kui palju energiat kulutab üks toode oma tarbimisaja jooksul. Toote kestvusaja moodustavad: tootmine, kasutamine ning kasutamise lõpetamine.