http://goldschmidt.info/2015/abstracts/abstractView?abstractId=2316
Goldschmidt2015 Abstracts 241 Artificially retuning the global weathering thermostat to cool the planet over the 21st Century DAVID J. BEERLING ([email protected]) Artificial enhancement of the chemical weathering sink for CO2 via distribution of pulverized silicate rocks across terrestrial landscapes might offer a macro-engineering strategy to offset anthropogenic C-emissions. I will describe recent global carbon cycle modelling demonstrating that enhanced weathering over one third of tropical land could lower end-of-century atmospheric CO2 by over 200 ppm depending on application rate and rock type. Significant unexploited opportunities exist for further deployment of enhanced weathering in the biofuel section. Increased land-ocean alkalinity fluxes that arise substantially reverse end-of-century anthropogenic ocean acidification, even under a ‘business-as-usual’ carbon emissions scenario, helping maintain the viability of tropical coral reefs. Enhanced weathering may offer a scalable climate change mitigation option, but major issues of cost, and social acceptability, should encourage urgent efforts to phase-down fossil fuel emissions. 241 -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/geoengineering. For more options, visit https://groups.google.com/d/optout.
