1. Sino-France Institute of Earth Systems Science, Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China
2. Laboratoire des Sciences du Climat et de l'Environnement, LSCE, CEA CNRS UVSQ, Gif sur Yvette 91191, France
3. International Institute for Applied Systems Analysis (IIASA), Laxenburg A-2361, Austria
4. The Institute of Environmental Engineering, University of Zielona Góra, Zielona Góra 65-417, Poland
5. Department of Earth System Science, Stanford University, Stanford 94305, USA
6. Statistics Division, Food and Agricultural Organization of the United Nations, Via Terme di Caracalla, Rome 00153, Italy
7. European Commission, Joint Research Centre, Ispra 21027, Italy
8. International Center for Climate and Global Change Research, School of Forestry and Wildlife Sciences, Auburn University, Auburn, Alabama 36849, USA
9. Global Carbon Project, CSIRO Oceans and Atmosphere, Canberra ACT 2601, Australia