Deforestation means cutting down or destroying tress at random, Deforestation takes place as a result of population problem, excessive pressure on land and our callousness . Population is increasing at a high rate. This additional people need more land for settlement and cultivation. Besides, some dishonest officers of forestry department are also responsible decreasing the percentage of trees and forests. The most serious deforestation is found in the tropical countries and in the countries of the third world. However, the after – effects of deforestation are catastrophic in quality and many in number . Tress keep the balance of oxygen and carbon dioxide in the atmosphere . When tress are cut down callously, the amount of carbon dioxide in the atmosphere . When trees are cut down callously , the amount of carbon dioxide increases . This causes global warming . As a result , the sea – level rises and it causes floods and other natural calamities . Moreover , wildlife is terribly affected . It disturbs the ecological balance . We should be conscious about the harmful effects of cutting trees. We should plant trees on both sides of roads and highways , and on waste land to prevent deforestation.