1. Yearly Carbon Dioxide Peak.https://medialibrary.climatecentral.org/resources/yearly-carbon-dioxide-peak(accessed July 29,2021).
2. Farquhar, G. D.
Fasham, M. J. R.
Goulden, M. L.
Heimann, M.
Jaramillo, V. J.
Kheshgi, H. S.
Le Quéré, C. The Carbon Cycle and Atmospheric Carbon Dioxide;TAR Climate Change 2001: the Scientific Basis;IPCC:2001.