Which of the following statements best explains the benefits of using windmills or wind turbines as compared to burning fossil fuels ? a. windmills or wind turbines produce clean air as compared to fossil fuels whose emissions contribute to global warming. b. windmills or wind turbines produce contaminated air as compared to fossil fuels which cause no change in global warming. c. windmills or wind turbines produce too much carbon dioxide as compared to fossil fuels which add more oxygen into the atmosphere. d. windmills or wind turbines add too much carbon dioxide into the oceans as compared to fossil fuels which add more oxygen into the atmosphere.