Question

If forest disappear we will be destroyed.
Give reason to support this answer

Answer 1

If forests are destroyed, animals and other creatures of the forests will come out to human settlements searching for a place to stay. They will be killed more and more by humans.
Environment goes into an imbalance. Humans will start fighting each other for wood and other plant materials. We will end up destroying each other for forest areas.
Slowly, the Carbon dioxide levels rise all over the world. Rains will become scarce, heat level in the world will increase to very high levels and soon a lot of places will become arid and dry. The snow clad peaks of mountains, frozen rivers and the ice at the poles will all melt at a rapid pace.
The sea levels will rise due to this and a lot of places will go underwater. The heat will start to evaporate the water and it will make Earth totally uninhabitable. Soon, "Everyone Dies (hypothetical scenario)"

Answer 2

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Forest is a home of a number of wild animals. Trees in the forest help to maintain balance in the environment. Green plant absorb harmful gases and release oxygen. Forests provide food, Herbs, raw materials for us. Many tribes depend on forest for their livelihood.