A forest that can swallow and spit out. Read the answer.

1. ① When there is a lot of rain, the forest can store water; when there is little rain, people can use the water source conserved by the forest;

② The forest absorbs carbon dioxide in the atmosphere and spits out fresh air.

2. ① More than one-third of the forests on the earth have been logged and destroyed;

② The amount of burning materials on the earth has increased, and the emission of carbon dioxide has increased.

3. Its function is to vividly and concretely illustrate the characteristics of the forest "being able to swallow and spit" and its role in maintaining the ecological environment.

4. “Nearly 200 years” indicates a short time, and “more than one-third” indicates a large scope or large number.

5. ① Excessive population growth leads to the expansion of land development and other economic development activities.

②Industrial development without considering the consequences of ecological environment degradation leads to increased pollution.

6. Forests are like reservoirs, which are beneficial to agriculture, forestry and animal husbandry. They can store more rain and spit out less rain.

Forests are priceless treasures that humans cannot live without.