atmospheric rise of carbon dioxide hot air from air conditioner exhaust methane gas escaping from landfills body heat generated by overpopulation
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following is believed to be one cause of global warming?
Possibilities:
- atmospheric rise of carbon dioxide
- hot air from air conditioner exhaust
- methane gas escaping from landfills
- body heat generated by overpopulation

atmospheric rise of carbon dioxide