Nature Climate Change, Published online: 16 April 2025; doi:10.1038/s41558-025-02316-y
In the past decades, the duration and rate of carbon uptake have increased, enhancing ecosystem productivity. The uptake rate has a larger effect than the duration has on the temporal changes in productivity. Changes in productivity during the early and the late growing seasons are asymmetric, owing to inconsistent changes in the duration of carbon uptake over time.