How do we Know that humans are the major cause of global warming?

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Yes, I think human are responsible for global warming. There are many reasons for global warming. Now a day, people become more selfish for money. Now talk about the causes of global warming.

Smoke: We burn coal to build roads. It creates a lot of smoke. Buses, tracks, and bikes also make a lot of smoke. This smoke is harmful for all living creatures. This smoke is responsible for global warming. Smoke is polluting our environment.

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Cutting down trees a large number: Cutting down trees cause global warming. Trees are our best friend. We rely on trees to survive. The trees give us oxygen, wood, shade etc. Trees also maintain environmental balance. Trees are also protect us from many natural calamities. But many greedy people are cutting trees for money. Global warming is due to excessive cutting of trees.  The world's temperature is rising If this happens, the world will become uncomfortable to live. So, we should plant more trees.

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Technology: Technology is also responsible for global warming. We use refrigerator, aerosol etc. We use refrigerator for preserving food or vegetable. But refrigerator produce CFC gas. CFC gas is very  harmful for all. CFC gas is attack our ojon layer. It creat hole in ojon layer. As a result many harmful ray coming from sun to earth. This ray are harmful for both human and animals. Aerosol also produce CFC gas. People uses those.

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At last it can say that human are the main culprit for global warming.