You are presented with the question "Certain types of electricity production can cause acid rain and contribute to:" and the following answer choices: 
- global cooling
 - global warming
 - energy usage
 - coal mining
 - deforestation
 - electrical
 - Destroy bridges
 - salinity

Now knowing that coal is used to produce electricity by burning in coal-fire power stations and coal-fired power stations can cause acid rain and contribute to global warming, choose the best answer.


 

  global warming       