Net carbon uptake has increased through warming-induced changes in temperate forest phenology

T. F. Keenan, J. Gray, M. A. Friedl, M. Toomey, G. Bohrer, D. Y. Hollinger, J. William Munger, J. O’Keefe, H. P. Schmid, I. Sue Wing, B. Yang, and A. D. Richardson

Nature Climate Change (1 June 2014)