How is reforestation done? Why is reforestation important?

Explanation

Reforestation is done by planting new trees in the destroyed forest. Generally the planted tress are of the some species which were found in that forest. Reforestation can take place naturally also. If the deforested area is left undisturbed it establishes itself. In natural reforestation, there is no role of human beings.
Reforestation is important as it helps to retain our green wealth for future generations.