1.          

2.(a)  Which fuel produces no waste gases?

  (b)  Why does this fuel cause a very serious pollution?

3.(a)  Which fuel produces the most solid waste?  

   (b)  Which fuel produces the least pollution? coal oil gas

4. (a)  Which waste gas increases the greenhouse effect?

   (b)   Which fuel causes the biggest increase in the greenhouse effect?

5.  (a)  Which two gases cause acid rain?  and

     (b)  Which fuel produces most of the gases that cause acid rain?

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