CO₂ flows into the system from natural sources including respiration, decomposing materials, natural forest fires, etc.
1
| 1 | Unit of CO₂ naturally entering the system |
| 0 | Units of additional CO₂ entering the system |
| 1 | Unit of CO₂ naturally leaving the system |
2022 level of 417 ppm CO₂ (50% increase)
Preindustrial level of 278 ppm CO₂
CO₂ flows out of the system through natural processes including photosynthesis, soil absorption, ocean uptake, etc.