Fact 1: Global warming is when worldwide temperature increases.

Fact 2: Global warming is caused by carbon dioxide trapped in the atmosphere.

Given the two facts above, answer the question "What does carbon dioxide cause?" with the following options: 
- skateboards
 - Greenhouse gases
 - Worldwide temperature increase
 - major threat to health
 - direct damage to the lungs
 - running
 - a lot of human deaths
 - Temperature decrease


 

   Worldwide temperature increase      