Over the years, the environment has encountered quite a number of significant changes and which are not for the better. Currently, the globe is experiencing a lot of environmental concerns with problems like pollution, global warming, environmental degradation and ozone layer depletion taking center stage. These environmental problems are brought about by harmful human activities in the biophysical environment. This paper delves into the current environmental issue facing the world, narrowing down to Nepal as a case study. The theories and concepts that pertain these environmental issues will also be discussed.