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3 questions
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  • Q1

    The presence or introduction into the environment of substances or things tha tcause harm or discomfort to living organisms

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    15s
  • Q2

    An increase in Earth's average surface temperature due to rising levels of greenhouse gases, primarily carbon dioxide, in the atmosphere

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    Type an Answer
    20s
  • Q3

    A thinninof Earth's ozone layer

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    30s

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