Definition of theme - Environment.

The natural environment, commonly referred to simply as the environment, encompasses all living and non-living things occurring naturally on Earth or some region thereof.

The concept of the natural environment can be distinguished by components:

• Complete ecological units that function as natural systems without massive human intervention, including all vegetation, animals, microorganisms, soil, 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 humans. 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

-Wikipedia.org (http://en.wikipedia.org/wiki/Natural_environment)

environment |enˈvīrənmənt; -ˈvī(ə)rn-|

noun

1 the surroundings or conditions in which a person, animal, or plant lives or operates. - (like the community and peoples)

• [usu. with adj. ] the setting or conditions in which a particular activity is carried on : a good learning environment.

• [with adj. ] Computing the overall structure within which a user, computer, or program operates : a desktop development environment.

2 ( the environment) the natural world, as a whole or in a particular geographical area, esp. as affected by human activity.

-Macbook Dictionary (/Applications/Dictionary)

en⋅vi⋅ron⋅ment  [en-vahy-ruhn-muhnt, -vahy-ern-] Show IPA

–noun

1.	the aggregate of surrounding things, conditions, or influences; surroundings; milieu.- (What surrounds the thing and the condition the thing is in.)
2.	Ecology. the air, water, minerals, organisms, and all other external factors surrounding and affecting a given organism at any time.
3.	the social and cultural forces that shape the life of a person or a population.
4.	Computers. the hardware or software configuration, or the mode of operation, of a computer system: In a time-sharing environment, transactions are processed as they occur.
5.	an indoor or outdoor setting that is characterized by the presence of environmental art that is itself designed to be site-specific. -Dictionary.com (http://dictionary.reference.com/browse/Environment) Environment: The aggregate of surroundings, conditions, or influences; surroundings; milieu in which a person, animal, or plant lives or operates, that encompasses all living and non-living things occurring naturally on Earth or some region thereof.