Worth a look by any interested in "where we are going" overall wrt energy and in related areas (ie most others). "Fracking"* is a contentious topic and I (very largely) avoid posts here or elsewhere which discuss the merits or otherwise of the process. (* Fracking =3D hydraulic fracturing of oil shale formations using horizontal(ish) bores off vertical(ish) access bores to release hydrocarbons (largely "natural gas") from structures which are not economically using more conventional methods) The merits of this process is NOT what the article cited below is about. Despite it's somewhat critical title the article seems to give a reasonable overview of recent efforts by various "reasonably competent" bodies to produce good quality estimates of likely long term hydrocarbon production capacity using fracking as an enabling technology. Estimates are sought for US and worldwide resources. The results obtained vary substantially between the bodies concerned, partially for reasons explained in the article. However, the overall indications are that capacities are liable to be lower to far lower than has generally been stated. http://www.nature.com/news/natural-gas-the-fracking-fallacy-1.16430 PDF (maybe) * http://www.nature.com/polopoly_fs/1.16430!/menu/main/topColumns/topLeftColu= mn/pdf/516028a.pdf Russell _______________________________________ * My internet has been throttled to < 100 kbps for boring reasons and may return to normal at midnight if the amazingly competent and surprisingly fluent English speaking lady on the help desk in the Phillippines has managed to persuade thje not always as competent local ISP to set things right "after midnight" as promised. Until then a PDF download is a challenge. Stop press: Yep. That's the one. --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .