adding more heat and carbon dioxide. reducing the amount of necessary heat. taking water vapor out of the atmosphere. putting more oxygen in the atmosphere.
I gave my students this multiple choice question: The burning of fossil fuels affects the atmosphere by

Only one answer is correct among these 4 choices:
- adding more heat and carbon dioxide.
- reducing the amount of necessary heat.
- taking water vapor out of the atmosphere.
- putting more oxygen in the atmosphere.

Could you tell me which one is correct?

adding more heat and carbon dioxide.