Since young, most of us were taught throwing things away equates to wasting.
Throwing things away may sometimes be indeed wasteful. However, most people do not realize that most of the wastage do not occur when we are discarding them, but at the point of acquisition. Much of our wastage are the consequences of our reckless buying.
So, the next time you stand in line at the cashier, spend an additional moment to contemplate if you really need to buy those stuff.