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This chapter investigates the role of natural disasters in the degradation of the environment. In recent times, environmental degradation has become a matter of public concern. We studied the natural disasters occurring in the earth on the three types i.e. land, air and water. Globally, it is estimated that more than 100 types of disasters affect living beings and their environment. Therefore, this chapter, we have discussed the natural disasters, their causative phenomenon, types, causes and impacts on living beings including the form of deaths occurred worldwide. The sternness of a disaster is measured in lives lost, economic loss, and the skill of the inhabitants to rebuild. The life-threatening potential of any natural threat is assessed basically by its spatial degree and sternness. It has resulted in the degradation of the environment at an alarming rate. Mitigation plans are generally followed to protect the environment and reduce the adverse effect of disaster. Besides this, we also discussed the precaution, mitigation measures with do's and don'ts when natural disasters have happened.