Nature Climate Change, Published online: 12 August 2024; doi:10.1038/s41558-024-02090-3
While experiments in younger trees support increased production under higher CO2, it is unclear whether more mature trees can respond similarly. Here, the authors show increased production of biomass in a 180-year-old Quercus robur L. woodland under 7 years of free-air CO2 enrichment (FACE).