The timeframe of the analysis is not clear. The article cites estimates of "upper limits" on CDR methods, but what is the nature of these limits - economic, physical, biological? Some of these estimates refer to 2100, but a clear timeframe does not appear to be explicitly declared, so I don't know how directly comparable all of these estimates on "upper limits" are.
So once again, I will make my usual observation that these projections about end-of-century CDR capacity are *absurd* if they do not include a rigorous accounting of technological advancement in the interim. In particular, automation via machine labor is likely to *radically* expand CDR methods that are dependent upon any non-biological factors of production (e.g. abiotic material inputs, energy inputs, and labor inputs). See my publications for details. - Adam On Aug 24, 2017 5:28 AM, "Andrew Lockley" <andrew.lock...@gmail.com> wrote: http://onlinelibrary.wiley.com/doi/10.1002/wene.253/full Slicing the pie: how big could carbon dioxide removal be? Authors - Peter Psarras, 1. <http://onlinelibrary.wiley.com/advanced/search/results?searchRowCriteria%5B0%5D.fieldName=author&start=1&resultsPerPage=20&searchRowCriteria%5B0%5D.queryString=%22Peter%20Psarras%22> - Holly Krutka, - Mathilde Fajardy, 1. <http://onlinelibrary.wiley.com/advanced/search/results?searchRowCriteria%5B0%5D.fieldName=author&start=1&resultsPerPage=20&searchRowCriteria%5B0%5D.queryString=%22Mathilde%20Fajardy%22> - Zhiqu Zhang, 1. <http://onlinelibrary.wiley.com/advanced/search/results?searchRowCriteria%5B0%5D.fieldName=author&start=1&resultsPerPage=20&searchRowCriteria%5B0%5D.queryString=%22Zhiqu%20Zhang%22> - Simona Liguori, 1. <http://onlinelibrary.wiley.com/advanced/search/results?searchRowCriteria%5B0%5D.fieldName=author&start=1&resultsPerPage=20&searchRowCriteria%5B0%5D.queryString=%22Simona%20Liguori%22> - Niall Mac Dowell, 1. <http://onlinelibrary.wiley.com/advanced/search/results?searchRowCriteria%5B0%5D.fieldName=author&start=1&resultsPerPage=20&searchRowCriteria%5B0%5D.queryString=%22Niall%20Mac%20Dowell%22> - Jennifer Wilcox - <wil...@mines.edu> 1. - <wil...@mines.edu> <http://onlinelibrary.wiley.com/advanced/search/results?searchRowCriteria%5B0%5D.fieldName=author&start=1&resultsPerPage=20&searchRowCriteria%5B0%5D.queryString=%22Jennifer%20Wilcox%22> - First published:28 July 2017Full publication history <http://onlinelibrary.wiley.com/doi/10.1002/wene.253/full#publication-history> - DOI:10.1002/wene.253 View/save citation <http://onlinelibrary.wiley.com/enhanced/exportCitation/doi/10.1002/wene.253> - Cited by (CrossRef):0 articlesCheck for updates <http://onlinelibrary.wiley.com/enhanced/refreshCitedBy?doi=10.1002/wene.253&refreshCitedByCounter=true> Citation tools - <https://www.altmetric.com/details.php?domain=onlinelibrary.wiley.com&doi=10.1002%2Fwene.253> - Conflict of interest: The authors have declared no conflicts of interest for this article. Abstract The current global dependence on fossil fuels to meet energy needs continues to increase. If a 2°C warming by 2100 is to be prevented, it will become important to adopt strategies that not only avoid CO2 emissions but also allow for the direct removal of CO2 from the atmosphere, enabling the intervention of climate change. The primary direct removal methods discussed in this review include land management and mineral carbonation in addition to bioenergy and direct air capture with carbon capture and reliable storage. These methods are discussed in detail, and their potential for CO2 removal is assessed. The global upper bound for annual CO2removal was estimated to be 12, 10, 6, and 5 GtCO2/year for bioenergy with carbon capture and reliable storage (BECCS), direct air capture with reliable storage (DACS), land management, and mineral carbonation, respectively—giving a cumulative value of ~35 GtCO2/year. However, in the case of DACS, global data on the overlap of low-emission energy sources and reliable CO2storage opportunities—set as a qualification for DAC viability—were unavailable, and the potential upper bound estimate is thus considered conservative. The upper bounds on the costs associated with the direct CO2removal methods varied from approximately $100/tCO2 (land management, BECCS, and mineral carbonation) to $1000/tCO2 for DACS (again, these are the upper bounds for costs). In this review, these direct CO2 removal technologies are found to be technically viable and are potentially important options in preventing 2°C warming by 2100. *WIREs Energy Environ* 2017, 6:e253. doi: 10.1002/wene.253 -- 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 geoengineering+unsubscr...@googlegroups.com. 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