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Deforestation: Cutting down trees is called deforestation. Afforestation: Planting the trees is called afforestation. 2. It is a bad sign of damage to the earth. It is a good sign of development of the environment. 3. It can be a disaster to the world. It helps in development. Of the world. 4. Many things happens like tsunami and earthquakes. We can avoid tsunamis and earthquakes.
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deforestation :- 
the cutting down of trees is termed as deforestation .
afforestation :-
the planting of trees is termed as afforestation.
              i hope it helps..............................^_^
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