It can be explained from the use of air, for example, it can supply oxygen in the air to support natural combustion, and oxygen can be used in steelmaking and gas welding in industry; Nitrogen can be used as nitrogen fertilizer or food protection gas; Carbon dioxide can allow plants to carry out photosynthesis; Rare gases have more uses. Therefore, it can be said that air is a precious natural resource for human beings. Rare gases have more uses. Therefore, it can be said that air is a precious natural resource for human beings.