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Direct and indirect metabolic CO2 release by humanity
1Département des sciences biologiques, Université du Québec à Montréal, P.O. Box 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 the 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, has increased 7 fold since pre-industrial times and is forecasted to continue to rise over the 21st century.
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Citation: Prairie, Y. T. and Duarte, C. M.: Direct and indirect metabolic CO2 release by humanity, Biogeosciences Discuss., 3, 1781-1789, 2006. Bibtex EndNote Reference Manager
