You are presented with the question "Driving a car contributes to " and the following answer choices: 
- dark matter
 - Quality of life
 - global warming
 - salty cashews
 - kinetic energy
 - lowered energy cost
 - expansion of the universe
 - survive

Now knowing that gases released during the use of fossil fuels causes global warming and cars and factories burn fossil fuels, releasing nitrogen oxide gases and reactive organic compounds, choose the best answer.


 

   global warming      