The main reasons for climate change are:

# Deforestation 

# Excess emissions from vehicles 

# Emission of Chloro Fluoro Carbons

#  Unprecedented production and use of non-biodegradable things

# Anthropogenic Global Warming (AGW).

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5 reasons for climatic changes on earth are : 
1. Industrialization 
2. Pollution 
3. Releasing of harmful gases and even liquid and solid wastes into the environment before neutralizing them. 
4. Deforestation and even increasing population on the earth. 
5. Global warming.