You are presented with the question "What can can cause an increase in the temperature of the lower atmosphere?" and the following answer choices: 
- solar flares
 - burning fossil fuels
 - gas expanding
 - Dehydration
 - Warm air moving into cold air
 - radio waves
 - Greenhouse gasses
 - Greenhouse gases

Now knowing that burning fossil fuels increases the carbon in the atmosphere and an increase in carbon dioxide, therefore, can cause an increase in the temperature of the lower atmosphere, choose the best answer.


 

  burning fossil fuels       