World soils contain 2500 Pg C to 1-m depth, comprising of 1500 Pg of soil organic C (SOC) and 950 Pg of soil inorganic C (SIC) (Houghton, 2007;Lal, 2004). Therefore, the soil C pool is 3.1 times more C than the atmospheric pool (800 Pg and increasing at the rate of 4.1 Pg C·yr−1) and 4.0 times the biotic pool (620 Pg and decreasing at the rate of 1.6 Pg C·yr−1). The current global C budget comprises anthropogenic emissions of 8.0 Pg C·yr−1 from fossil fuel combustion and cement manufacture, and 1.6 Pg C·yr−1 from deforestation, biomass burning and soil cultivation. Of the total emission of 11.5 Gt C E (including CO2, CH4 and N2O) in 2000, 14% (1.6 Pg) were those due to agricultural activities and 18% (2.1 Pg) from land use conversion. Thus, land use and agriculture contribute about one-third (32%) of total anthropogenic emissions. Confirmed sinks include atmospheric absorption of 4.1 Pg C·yr−1, oceanic uptake of 2.3 Pg C·yr−1, and a land sink of about 1.5 Pg C·yr−1 (WMO, 2008). Thus, there is an unknown terrestrial sink of about 1.7 Pg C·yr−1.


  1. Broecker WS (2008) CO2 capture and storage: possibilities and perspectives. Elements 4: 295–296Google Scholar
  2. Canadell JP, Que’re’ CL, Raupach MR, Field CB, Buitenhuis ET, Ciais P, Conway TJ, Gillett NP, Houghten RA, Marland G (2007) Contributions to accelerating atmospheric CO2 growth from economic activity, carbon intensity, and efficiency of natural gas sinks. Available at: http://www.pnas.org/cgi/doi/10.1073/pnas.070273 7104Google Scholar
  3. Hansen J, Sato M, Kharecha P, Beerling D, Berner R, Masson-Demotte V, Pagani M, Raymo M, Royer DL, Zachus JC (2008) Target atmospheric CO2: Where should humanity aim? Safe CO2, British Columbia, CAGoogle Scholar
  4. Holdren JP (2008) In proceedings of Climate Challenge. Eighth Annual John P. Chafee Memorial Lecture on Science and the Environment. National Council of Sci. & Env, 17 January 2008, Washington DCGoogle Scholar
  5. Houghton RA (2007) Balancing the global carbon budget. Ann. Rev. Earth Planet. Sci. Lett. 35: 313–347CrossRefGoogle Scholar
  6. Koonin SE (2008) The challenges of CO2 stabilization. Elements 4: 293–294Google Scholar
  7. Lal R (2004) Soil carbon sequestration impact on global climate change and food security, Science 304: 1623–1627CrossRefGoogle Scholar
  8. Lal R (2008) Carbon sequestration. Phil. Trans. Roy. Soc. (B) 363: 815–830CrossRefGoogle Scholar
  9. McKinsey, Co. (2008) Pathways to Law Carbon Economy. Version 2 of the Global Greenhouse Gas Abatement Cost CurveGoogle Scholar
  10. Oelkers EH, Cole DR (2008) Carbon dioxide sequestration: A solution to a global problem. Elements 4: 305–310CrossRefGoogle Scholar
  11. Ruddiman WF (2005) The anthropogenic greenhouse era began thousands of years ago. Climatic Change 61: 262–292Google Scholar
  12. WMO (2008) Greenhouse Gas Bulletin. World Meteorological Organization, Geneva, SwitzerlandGoogle Scholar

Copyright information

© Zhejiang University Press, Hangzhou and Springer-Verlag Berlin Heidelberg 2010

Authors and Affiliations

  1. 1.Carbon Management and Sequestration CenterThe Ohio State UniversityColumbusUSA

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