First of all we must know what trees are then only we can come to the role of trees in the life of a human being.
Trees are the only living beings which don’t depend on the bio system for their living but instead they are the living beings which are being depended by the human beings.
But we the humans are not loyal to the trees we the humans are deforesting the forests which is the home land of trees.
The trees are the only living beings which absorb carbon-di-oxide and use it for their food purpose and reproduce oxygen which is being used by the rest living beings, by seeing this one can tell that the main primary producers are the plants only but not we the human beings.
The role of trees in the life of a human being is kind a tough subject to explain but one common man can tell that the life of a human being is totally dependent on the trees but human respiration is only because of the trees without trees human being cannot lead his life instead the trees can lead their life without a human being.
By seeing all this one can understand that the role of trees is a very important concept in the life of a human being.