![](https://obsant.eu/wp-content/uploads/2022/10/decroiss-postcroiss.jpeg)
...In the canopy, photosynthesis rates are up to a third higher on sunny summer days in the CO₂-rich patches. Over a growing season, the increase is about a fifth. These are big numbers: imagine if your annual income went up by a fifth. Photosynthesis is the forest’s carbon income.