The dominant role of semi-arid ecosystems in the trend and variability of the land CO2 sink. - Ahlström, Anders; Raupach, Michael R.; Schurgers, Guy; Smith, Benjamin; Arneth, Almut; Jung, Martin; Reichstein, Markus; Canadell, Josep G.; Friedlingstein, Pierre; Jain, Atul K.; Kato, Etsushi; Poulter, Benjamin; et al. (Science (pre-March 2025), 2015)