Global warming is a phenomenon the average temperature of the air and the oceans on Earth, according to the observed increase in recent decades.
The cause is mainly caused global warming is caused by an economic development from human activity (construction, economics, science, ..). In addition, air pollution is also a major cause of this is the presence a foreign substance or an important change in the composition of air, making the air cleaner, or cause smells, odorous bear, reduced visibility (due to dust).
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