Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Volume 4, issue 2
Biogeosciences, 4, 215–217, 2007
https://doi.org/10.5194/bg-4-215-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.
Biogeosciences, 4, 215–217, 2007
https://doi.org/10.5194/bg-4-215-2007
© Author(s) 2007. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  10 Apr 2007

10 Apr 2007

Direct and indirect metabolic CO2 release by humanity

Y. T. Prairie1 and C. M. Duarte2 Y. T. Prairie and C. M. Duarte
  • 1Département des sciences biologiques, Université du Québec à Montréal, Case postale 8888, succ. Centre-Ville, Montréal, H3C 3P8, Canada
  • 2IMEDEA (CSIC-UiB), Instituto Mediterráneo de Estudios Avanzados, C/ Miquel Marqués 21, 07190 Esporles (Mallorca), Spain

Abstract. The direct CO2 released by respiration of humans and domesticated animals, as well as CO2 derived from the decomposition of their resulting wastes was calculated in order to ascertain the direct and indirect metabolic contribution of humanity to CO2 release. Human respiration was estimated to release 0.6 Gt C year−1 and that of their associated domestic animals was estimated to release 1.5 Gt C year−1, to which an indirect release of 1.0 Gt C year−1, derived from decomposition of the organic waste and garbage produced by humans and their domestic animals, must be added. These combined direct and indirect metabolic sources, estimated at 3.1 Gt C year−1, have increased 7 fold since pre-industrial times and are predicted to continue to rise over the 21st century.

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