Over-consumption is when you use more of something than you really need. It usually happens when people buy or use more of something than they need or when they use it faster than it can be replaced. For example, if you buy too much food, then you won't be able to eat it all before it goes bad and you will have wasted it. Over-consumption can also lead to wasting important resources like energy or water, which can mean that the Earth's resources will eventually run out.