Carbon dioxide is drawn in by the natural plant from the air which surrounds it. This is necessary for growth and fruit production. In the Word of God the Holy Spirit is compared to air or wind:
The wind breathes where it will, and thou canst hear the sound of it; but knowest thou nothing of the way it came or the way it goes; so it is when a man is born on the breath of the spirit. (John 3:8) Knox Translation
The "wind" of the Holy Spirit blowing across your life is much like the wind in the natural world. It scatters the seeds of the Word of God, separates the wheat from the chaff in your spiritual life, and fans the dying coals of your spiritual zeal to set you ablaze for God.