Today, water resources are finite, the needs of humans is infinite. People only know to use without known to protect water supplies. The level of pollution is increasingly growing, the social needs of the growing man rises to dizzying, it caused great impact on all living things. The water drained condition caused the tremendous harm to humanity, particularly fresh water sources. Depleted freshwater sources has become alarming. How is "dried up water sources"? Drained water is the decline in the number of water supplies.
đang được dịch, vui lòng đợi..
