Scientific evidence suggests that there is more carbon dioxide in the atmosphere today than there was a hundred years ago. some scientists theorize that because fossil fuels, such as oil and coal, have carbon in them, fossil fuel burning has caused the increase in carbon in the atmosphere. what best describes the movement of carbon in this case?

Ibelieve the answer is relative humidity  because it makes more sense that way. solar flares usually occur in space it doesn't affect the earth, well it could but it wont make a significant damage.  latitude is land it doesnt do anything. prevailing winds, i dont know the correct meaning for this but i doubt that affects the land so it has to be relative humidity.