Fact 1: Gases released during the use of fossil fuels causes global warming.

Fact 2: Oil is a fossil fuel.

Given the two facts above, answer the question "Gases released during the use of what causes global warming?" with the following options: 
- coal
 - CO 2
 - Globe shaped cake warming
 - CO2
 - oil
 - CFCs
 - Warming plates
 - Paper Mache Globe making


 

     oil    