Ron: See "Thermostatting the Earth"
http://www.pipeline.com/~lenornst/ThermostattingTheEarth.pdf There I note that virtually all discussions of dealing with AGW virtually completely ignore the potential for *very large *contributions to *lowering* the atmospheric concentration of CO2 to pre-industrial levels - that is by* 8 or more wedges* - by applying Irrigated Afforestation o! large, subtropical deserts, and by sustainable, eco-neutral, conservation harvest (SENCH) in 'virgin' tropical forests (both open source 2009 papers on these subjects are cited therein)! The general subject of large scale drawdown of atmospheric CO2 needs to be brought into all discussions of how to deal with AGW! Len Ornstein On Friday, January 11, 2013 1:56:27 PM UTC-5, Greg Rau wrote: > > Anyone for GE? - Greg > > Environmental Research Letters <http://iopscience.iop.org/1748-9326/> Volume > 8 <http://iopscience.iop.org/1748-9326/8>Number 1 > <http://iopscience.iop.org/1748-9326/8/1> > > Steven J Davis *et al* 2013 *Environ. Res. Lett.* *8* 011001 > doi:10.1088/1748-9326/8/1/011001<http://dx.doi.org/10.1088/1748-9326/8/1/011001> > Rethinking wedges OPEN ACCESS > > Steven J Davis1,2, Long Cao2,3, Ken Caldeira2 and Martin I Hoffert4 > Show > affiliations<http://iopscience.iop.org/1748-9326/8/1/011001?v_showaffiliations=yes> > > > [email protected] <javascript:> [email protected] > <javascript:>[email protected] > <javascript:>[email protected] <javascript:> > > 1 Department of Earth System Science, University of California, Irvine, > Irvine, CA 92697, USA > 2 Department of Global Ecology, Carnegie Institution of Washington, > Stanford, CA 94305, USA > 3 Department of Earth Sciences, Zhejiang University, Hangzhou, Zhejiang > Province, 310027, People's Republic of China > 4 Department of Physics, New York University, New York, NY 10003, USA > > Tag this > article<https://ticket.iop.org/login?return=http%3A%2F%2Fiopscience.iop.org%2FtagInputWindow%3FarticleId%3D1748-9326%2F8%2F1%2F011001%26returnUrl%3Dhttp%253A%252F%252Fiopscience.iop.org%252F1748-9326%252F8%252F1%252F011001%26fromUrl%3Dhttp%253A%252F%252Fiopscience.iop.org%252F1748-9326%252F8%252F1%252F011001> > Full > text PDF (586 > KB)<http://iopscience.iop.org/1748-9326/8/1/011001/pdf/1748-9326_8_1_011001.pdf> > > > > *Abstract* > > Stabilizing CO2 emissions at current levels for fifty years is not > consistent with either an atmospheric CO2 concentration below 500 ppm or > global temperature increases below 2 °C. Accepting these targets, solving > the climate problem requires that emissions peak and decline in the next > few decades, and ultimately fall to near zero. Phasing out emissions over > 50 years could be achieved by deploying on the order of 19 'wedges', each > of which ramps up linearly over a period of 50 years to ultimately avoid > 1 GtC y-1 of CO2 emissions. But this level of mitigation will require > affordable carbon-free energy systems to be deployed at the scale of tens > of terawatts. Any hope for such fundamental and disruptive transformation > of the global energy system depends upon coordinated efforts to innovate, > plan, and deploy new transportation and energy systems that can provide > affordable energy at this scale without emitting CO2 to the atmosphere. > > * > * > -- You received this message because you are subscribed to the Google Groups "geoengineering" group. To view this discussion on the web visit https://groups.google.com/d/msg/geoengineering/-/sDxBIbyNf0IJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/geoengineering?hl=en.
