Answer the following question: Fact 1: Burning fossil fuels increases the carbon in the atmosphere. Fact 2: Global warming is caused by carbon dioxide trapped in the atmosphere. Given the two facts above, what kind of fuel use adds the most to global warming?

Choose your answer from: a. elbow grease. b. vehicles. c. fossil. d. Pollution. e. engines. f. Cars. g. hydroelectricity. h. solar energy.
Answer:
c.