Plant biomass is reduced. Deforestation causes much damage to the structure of the natural forest. For examples,  in Malaysia and the Philippines.

     Biological diversity is greatly reduced. The destruction of tropical rainforest will reduce the biological diversity (both plants and animals) by reducing its genetic base. Valuable species of economic/ medicinal value are lost.

     Ecosystem stability is reduced. Savanna are penetrated into forest. Tropical hardwood emergents are tall trees and take a long time to mature. This makes forest regeneration difficult and slow, and forest depletion leads to inferior secondary growth and invasion by weeds.

B. Animals

     Fauna (birds and tree animals) living in the top canopy of the natural forest are dehomed. So, their habitats are disturbed. In turn the food chain in the forest is interrupted. All these may cause extinction of some species.