The Green Planet

(gentle music) -

Narrator

As the sun times in the sky, bubbles of gas appear, (water gurgling) evidence of photosynthesis. (gentle music) (water gurgling) Deep inside the plant cells, tiny structures called chloroplasts move towards the light. They absorb carbon dioxide and use the sun's power to synthesize the sugars that the plant needs to grow. (gentle music) And, as a byproduct, they release oxygen, the gas that we and all other animals must have in order to breathe. (gentle music) (water gurgling) (gentle hopeful music) Now in late afternoon, bubbles of oxygen make the river water fizz like champagne. (woman vocalizing) (water gurgling) (gentle music) (water gurgling)