Could you survive if there wasn't any carbon dioxide in the air?

People breathe oxygen, so you might think that carbon dioxide is not important. This is not true! If the air didn't have carbon dioxide, all green plants would die. Plants use carbon dioxide during photosynthesis. As a waste product of photosynthesis, plants release oxygen into the air—the oxygen you breathe! You couldn't survive without carbon dioxide, since the production of oxygen is part of the carbon cycle.