Upper level: e  ENVIRONMENTAL FACTORS

e2  Natural environment and humanmade changes to environment

This chapter is about animate and inanimate elements of the natural or physical environment, and components of that environment that have been modified by people, as well as characteristics of human populations within that environment.

Lower livel:

• e210  Physical geography

• e215  Population

• e220  Flora and fauna

• e225  Climate

• e230  Natural events

• e235  Human-caused events

• e240  Light

• e245  Time-related changes

• e250  Sound

• e255  Vibration

• e260  Air quality

• e298  Natural environment and human-made changes to environment, other specified

• e299  Natural environment and human-made changes to environment, unspecified

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