Afforesting is a positive effort in curbing the over use and destruction of natural forests

Explanation:

Afforestation simply refers to a campaign in favor of tree planting, against tree cutting in reserves or vegetation and the overall protection of the Forest reserve. Afforestation in the direct opposite of deforestation which is act of cutting down and destruction of forest trees. Trees are important part of our natural environment which plays economic, biological and chemical roles in the lives of the masses. Most notably, forest trees acts as carbon sink which in turn reduces depletion of the ozone layer. Even though their are economic derivatives in the cutting selling of forest planks for various purposes, tree planting culture must be legislated in other to avoid excessive use of forest reserves.

it would be c. xylem.