The natural environment encompasses all living and non-living things occurring naturally on Earth or some region thereof. It is an environment that encompasses the interaction of all living species. Climate, weather, and natural resources that affect human survival and economic activity.  The concept of the natural environment can be distinguished by components:Complete ecological units that function as natural systems without massive civilized human intervention, including all vegetation,microorganisms, soil, rocks, atmosphere, and natural phenomena that occur within their boundariesUniversal natural resources and physical phenomena that lack clear-cut boundaries, such as air, water, and climate, as well as energy,radiation, electric charge, and magnetism, not originating from civilized human activityIn contrast to the natural environment is the built environment. In such areas where man has fundamentally transformed landscapes such as urban settings and agricultural land conversion, the natural environment is greatly modified and diminished, with a much more simplified human environment largely replacing it. Even events which seem less extreme such as hydroelectric dam construction, orphotovoltaic system construction in the desert, the natural environment is substantially altered.