all living and non-living things occurring naturally on Earth or some region thereof From Wikipedia, the free encyclopedia
The Natural environment means all living and non-living things occurring naturally. It does not include human activity. The universe is natural, but often the term "natural environment" only means nature on Earth.
Two aspects are usually included::
There is also the built environment, which is not natural. There, man has changed landscapes and natural environment to make cities and agricultural land.
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