NOTE: It is impossible to enter Sanskrit in computers (at least for me). Since you can read and write Sanskrit, I hope you can translate it yourself. Hope I helped ( at least a bit) !
Trees occupy an important place in the life of man. The trees provide us flowers, fruits, fodder for animals, wood for fire and furniture and provide us cool shadow from the sun. They give as many things and expect nothing in return. It provides shelter not only to a child, but also to the woodcutter who cuts the tree down.
They gives us food and flowers for pleasure. They provide us timber / wood for building homes and for fuel. They provide us sleepers for the railway tracks.
The trees also provide medicines like eucalyptus.They play an important role in purification of air. They provide oxygen that sustains our life. Thus they make Earth a better place to live in.
Trees are necessary for getting rainfall. They attract rain bearing clouds and prevent soil erosion and conserve Earth. Even science has proved that trees are as necessary as food and water.
Even our government realized the importance of trees and taking steps to increase area under forests. Even the local communities responded through movements like the Chipko Andolan and the 'One man, one tree' scheme of Vinobha Bhave. Hence I like to conclude that trees are needed to sustain life on this Earth.