Air is a mixture of different gases like nitrogen and oxygen. Carbon dioxide is the most important contributor to human-caused global warming. _________________ _________________ Forest fires and cities

Air is a mixture of different gases like nitrogen and oxygen. Carbon dioxide is the most important contributor to human-caused global warming. _________________ _________________ Forest fires and cities with lots of car traffic cause air pollution.

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Air is a mixture of different gases like nitrogen and oxygen. Carbon dioxide is the most important contributor to human-caused global warming. _ …

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Air is a mixture of different gases like nitrogen and oxygen. Carbon dioxide is the most important contributor to human-caused global warming. _________________ ________________…

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Air is a mixture of different gases like nitrogen and oxygen. Carbon dioxide is the most important contributor to human-caused global warming. _ …