Friedlingstein P, Houghton RA, Marland G, et al. Update on CO2 emissions. Nature Geoscience. 2010;3:811-812. doi:10.1038/ngeo1022.
e C \ er\, Andres RJ, Boden T, et al. The global carbon budget 1959-2011. Earth System Science Data. 2013;5:165-185. doi:10.5194/essd-5-165-2013.
