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29 July, 16:57

1. In what year did people begin to understand air pollution would be a problem? Explain.

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  1. 29 July, 20:23
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    1937 because UT's the answer of the historian questions

    Explanation:

    because thats yyh and because of it being like thaf
  2. 29 July, 20:41
    0
    Before the Industrial Revolution, our planet's atmosphere was still untainted by human-made pollutants. At least, that's what scientists thought until recently, when bubbles trapped in Greenland's ice revealed that we began emitting greenhouse gases at least 2,000 years ago.
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