Give any three examples regarding the harmful impact of human modification of the environment .

Human activities have resulted in a number of changes in the environment:
 
a. Climate change : Human activities have resulted in various phenomena like global warming and melting of glaciers. This is resulting in an overall change in the temperature and climate of earth and its environment.


b. Depletion of ozone layer: Various chemicals like chlorofluorocarbon result in depletion of ozone layer. The depletion of the layer is resulting increased exposure to UV rays.


c. Pollution: Human activities have resulted in increased pollution of all natural resources like water, air, etc.
 

d. Deforestation: Deforestation rate has been increased with the increase in human population and industrialization. This has disturbed the normal cycling of water and nutrients in the environment. Also, it is a cause of global warming as carbon dioxide concentration is increasing with time.  It has also led to extinction of many species of plants and animals.


 e. Phenomena's like floods, landslides, Tsunami are the result of increase in the sea water level primarily caused due to global warming, melting of glaciers.
 

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