How global warming is caused
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Most climate scientists agree the main cause of the current global warming trend is human expansion of the "greenhouse effect"1 — warming that results when the atmosphere traps heat radiating from Earth toward space. Certain gases in the atmosphere block heat from escaping.
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Due to excess use of vehicles, huge amount of toxic gases are released into the atmosphere. The gases emitting from factories also cause pollution. These gases go up into the atmosphere. They have made holes into the ozone layer. Ultraviolet rays of sun are coming to earth. They reach to the earth and cause global warming.
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