The citizens of a town are aware of climate change, and they want to make changes to control it. One change they consider is replacing the nearby thermal power plant with a hydroelectric plant. If they want to make sure this change will help to slow climate change, which question should they ask?
A. Is it less expensive to build a hydroelectric power plant than a thermal power plant?
B. Does a hydroelectric power plant employ fewer people than a thermal power plant?
C. Does a hydroelectric power plant emit less CO2 than a thermal power plant?
D. Is the cost of operating a hydroelectric power plant less than the cost of running a thermal power plant?
