Pick your answer from: [+] storms; [+] oil; [+] cars; [+] coal; [+] air; [+] wind; [+] carbon; [+] water;
Q: You are presented with the quiz "what causes global warming?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "gases released during the use of fossil fuels causes global warming" and "fossil fuels are coal, oil, and natural gas". So, what's the best answer to the question?
A:
coal