public and health

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Which of the following statements is true?
Carbon monoxide is a greenhouse gas
The United States has effectively controlled its greenhouse gas emissions
Emission of greenhouse gases by various countries is proportional to the size of their population
Global warming is caused by greenhouse gases

I believe my best choice is D not entirely sure

  • public and health -

    D is correct, but so are others. What do your text materials say?

  • public and health -

    I think D is the best answer

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