Rubbish is a problem of environment nowadays. Many unconscious people throw a lot of rubbish away everyday. The rivers now are polluted, the air isn't as fresh as in the past and the animals die more and more. So, we have to reduce the amount of waste. But how? We shouldn't throw things away, we can reuse them. For example, we can use leftover food to make fertilize. We should only buy what things we really need. And when we go shopping, we should use cloth bags instead of plastic bag. Because of the Earth, we have to reduce the amount of waste.