You are presented with the quiz "What can can cause an increase in the temperature of the lower atmosphere?" 

But you don't know the answer, so you turn to your teacher to ask for hints. He says 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". 

So, what's the best answer to the question?


 

  burning fossil fuels         