If people were not Idiotic Creatures they would understand the life important value of trees. Not only clean air, but woods connection to water,health of rivers, lakes, connection to healthy earth.
In previous religions such as Druidism , and Aria religion, Trees were considered SACRED, as live beings. NOT EVEN ONE LIEF WAS ALLOWED TO BE CUT FROM THE TREES.

Woods are connected with human civilization itself. In previous epoch THE MIDDLE EAST WAS GREEN BASE. Than trees were cut down, and whole civilization moved to North Medditeranian, which was rich in woods. After destroying the woods, civilization moved to western Europe. Logical point is that when woods and trees are cut down , climate become more dry and cruel. On the long run people move to another wooden and wet climate.

There was one very famous historian in Persian time. He explain Persian lands as Paradise Garden , with wet lands, with woods, with large number of animals. Actually the word Garden have origin from Persia.

Today with the help of Human Stupidity and Ignorance, in this parts of Iran, not only there is deserts, but not even one animal can live there.

If humans were just more intelligent , they would make green all the deserts in the world. They would have much more resources and food. They would understand like ancient teachings stated, that water is connected to plants, and communicate with them.

More time will pass , till human morons understands the natural laws. This ridiculous liberal capitalism (exploiting the nature for profits) is just a small pox decease of a childish humanity stage of evolution.