I will give 25 points(thats all of mine)

Plants take in carbon dioxide to do photosynthesis and gives off oxygen, the sheep in the field breathes in the oxygen the plants made.  When the sheep dies, it would put carbon into the soil by decomposition.  The powerplant will use the fossil fuel in the soil to create power, and ends up putting carbon in the air again.  The stages repeats again and again.

Explanation:

50% lit on the left side