[satendra]

Carelessness and not uselessness is associated with waste.  Anything connected with insensitivity and thoughtlessness derives toward waste.  Eliminated or discarded as no longer useful or required after the completion of a process is waste.  It’s this careless action and attitude of ours which has led waste to be really a waste. 
we should start using leftover products as a resource and not let it become waste because of our careless action.