Q: Why is carbon dioxide important even though there is so little of it in the atmosphere?

Why is carbon dioxide important even though there is so little of it in the atmosphere?

Flexi Says: The amount of carbon dioxide in the atmosphere is extremely low, but it is extremely important since carbon dioxide is a greenhouse gas, which helps to keep Earth's climate moderate. Through photosynthesis, the inorganic carbon in carbon dioxide plus water and energy from sunlight is transformed into organic carbon (food) with oxygen given off as a waste product.