Over the past decades, our earth has witnessed progressive environmental degradation not just through natural wear and tear but also because of man’s unending mischiefs. The variations in the environment in terms of temperature, climate, land and a number of chemical and physical agents, both natural and man-made, affect man in numerous ways. Environmental risks are therefore a major burden and a global challenge too. In this course we will deal with the various threats that man is predisposed to, due to the effects of the environment.