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I have (4) simple multiple choice questions:
1. The most important greenhouse gas emitted by humans is:
     carbon dioxide  unburned hydrocarbons  nitrous oxides 
2. Which of the following countries has the highest per-capita emissions of carbon dioxide?
              India Japan The United States 
3. Which of the following international agreements to address climate change were ratified by the United States?
   The Camp David Accord The Paris Agreement The Trans-Pacific Partnership (TPP)
4. A big problem with Public Goods is:
free riders will attempt use them without paying for them.  firms find it difficult to produce them profitably.  they are too expensive for most consumers.  A and B.