Gasoline increases

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Across
  1. 2. What can help if we do it more than using cars?
  2. 3. What type of cars help with the reduces of gasoline?
  3. 5. What planet is being affected?
Down
  1. 1. What type of thing, when increases a lot affects the earth?
  2. 4. What type of transports can be with gasoline or with electricity?