Fact 1: Burning fossil fuels increases the carbon in the atmosphere.

Fact 2: An increase in carbon dioxide, therefore, can cause an increase in the temperature of the lower atmosphere.

Given the two facts above, answer the question "What can can cause an increase in the temperature of the lower atmosphere?" with the following options: 
- solar flares
 - burning fossil fuels
 - gas expanding
 - Dehydration
 - Warm air moving into cold air
 - radio waves
 - Greenhouse gasses
 - Greenhouse gases


 

  burning fossil fuels       