Refers to the known processes that have negative effects on the sustainability of the environmental quality necessary for the well being of the organism living in it. the main environmental problems facing the earth include the following;
- pollution
- overpopulation
- global warming
- waste disposal
- climate change
- loss of biodiversity
- desertification
- ocean solidification
- ozone layer depletion
- acid rain
- natural disaster
- overgrazing etc
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