First, the introduction of teaching

Now and in the future, human beings all over the world are facing the threat of resource and environmental problems such as lack of resources, river pollution, air turbidity and mountains of garbage. In fact, in real life, as long as we pay a little attention to the reasonable and moderate packaging of goods, we can avoid the damage of goods in the process of transportation and storage, which is convenient for consumers to carry. However, it exceeds the functional requirements of protecting and beautifying commodities, which will cause waste of resources and environmental pollution.

(Title on the blackboard: Overpackaging wastes a lot)

Second, learn new lessons.

1. Observe the common commodities in life and record how many layers of packaging they have and whether they are over-packaged.

2. Think about the harm that over-packaging will bring to human beings and society.

We look at the harm of over-packaging through calculation.