What is the difference between natural disasters and man-made disasters?

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In case of man-made disasters, The expert keep going developing technics like a nuclears for making better life.

>>In case of man-made disasters, the expert  are keep on developing technics like nuclear for making a better life.

This phenomenom raise(cuase)not also better conditon but emergency. 

>>With this phenomenon it doesn\'t cause a better conditon but emergency. 
 Without considering emergency, they just destroy the eco-system to make a cities.

>>Without considering emergency, they just destroy the eco-system to make cities.
 And these technic was imported from the advanced-countries. 

>> And this technic was imported from advanced-countries.
 imported contries are receiving that technic without alternatives/solutions when they meet serious problem.

>>Advance countries are receiving technics without alternatives/solutions when they meet serious problem.
because the technics and nuclear facilities are sensitive to some factors like a temperature and geographics.

>>Because the technics and nuclear facilities are sensitive to some factors like temperature and geographic.
 Therefore, man-made technics cause the users to happen to serious da mage compared with natural disasters. 

>>Therefore, man-made technics can cause serious damage compared to natural disasters. 
 I just think these reason tell everyoner that what is the differnece between disasters and man-made disasters.

>>I just think that for these reason, it tells everyone that what is the difference between disasters and man-made disasters.