@article {634800, title = {Five decades of northern land carbon uptake revealed by the interhemispheric CO2 gradient}, journal = {Nature}, volume = {568}, year = {2019}, pages = {221-225}, url = {https://www.nature.com/articles/s41586-019-1078-6}, author = {Philippe Ciais and Jianguang Tan and Xuhui Wang and Christian Roedenbeck and Frederic Chevallier and Shilong Piao and Roisin Moriarty and Gregoire Broquet and Corinne Le Quere and Pep Canadell and Shushi Peng and Benjamin Poulter and Zhu Liu and Pieter Tans} }