These combined direct and indirect metabolic sources, estimated at 3.1 GtC year−1, have increased 7 fold since pre-industrial times and are predicted to continue to rise over the 21st century.
Y. T. Prairie (1) and C. M. Duarte (2)
1. D´epartement des sciences biologiques, Universit´e du Qu´ebec `a Montr´eal, Case postale 8888, succ. Centre-Ville, Montr´eal, H3C 3P8, Canada
2. IMEDEA (CSIC-UiB), Instituto Mediterr´aneo de Estudios Avanzados, C/ Miquel Marqu´es 21, 07190 Esporles (Mallorca), Spain
Received: 26 October 2006 – Published in Biogeosciences Discuss.: 21 November 2006
Revised: 19 March 2007 – Accepted: 27 March 2007 – Published: 10 April 2007
Whereas metabolic CO2 release maybe far less amenable to change than emissions derived from deforestation, cement production or fossil fuel use, different human choices can affect human metabolic CO2 release.
The indirect metabolic CO2 release may be reduced through the promotion of behavioral changes to reduce the per capita consumption of meat and organic waste production, and the direct metabolic CO2 release may be reduced by adjusting human ingestion to requirements, avoiding the excess food ingestion affecting much of the population in developed societies, and that represents a health hazard as well, responsible for more than 1 in 10 deaths in the EU and USA (Banegas et al., 2003).
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