environment..

The natural environment, commonly referred to simply as the environment, is a terminology that comprises all living and non-living things that occur naturally on Earth or some region there of. This term includes a few key components:
Complete ecological units that function as natural systems without massive human intervention, including all vegetation animals, microorganisms, rocks, atmosphere and natural phenomena that occur within their boundaries.
Universal 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 human activity.
The natural environment is contrasted with the built environment, which comprises the areas and components that are strongly influenced by man. A geographical area is regarded as a natural environment (with an indefinite article), if the human impact on it is kept under a certain limited level .This level depends on the specific context, and changes in different areas and contexts. The term wilderness, on the other hand, refers to areas without human intervention.
People nowadays always think lightly about the environment. Some of us do not know about the importance of loving and caring about the environment. We need trees to produce oxygen. We need clean water to drink and we need fresh air to breath. Hence, we have to be more responsible to take care about our surroundings….
-Natural environment-wikipedia, the free encyclopedia