Air pollution

1. Is air pollution recognized as a threat to earth's ecosystem?

2. What kinds of air pollution do you now?

3. Is air pollution natural or man-made

4. Major air pollution included:

5. Air pollution caused by human activity ...

6. The World Health Organization states that ... from causes directly attributable to air pollution

7. Which of these countries emits the biggest amount of carbon dioxyde?

Yours age is:

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