Paying the ticket is very important because:

 

If you pay the ticket for the tube, you are paying for the electricity. This electricity is used for the energy and it’s electric energy and this isn't a problem for the environment.  this energy it’s better than gasoline and is very good for the environment too.

 

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When you don’t pay to use the tube, you aren’t paying for the electricity the tube needs. The tube is more economic than the car. It shouldn’t be a problem to pay for the tube because the car is more expensive to use.

 

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In conclusion if you pay the ticket, you don’t only help the tube, but you help the environment too.