The air pollution because plants can help to balance the weather to make our world.
Carbon dioxide is used by plants in the photosynthesis process, oxygen gas emissions come out so that organisms use to breathe.
Oxygen is a gas, which is essential for life.
If the human deforestation in much quantity, no fresh air in the atmosphere.
Where the trees were compared with the air filter, pure.
If there is no wood in our world of hospitality, no fresh air.