Oil, links to read.

http://www.sciencedaily.com/releases/2013/10/131028141516.htm U.S. Shale-Oil Boom May Not Last as Fracking Wells Lack Staying Power http://www.businessweek.com/articles/2013-10-10/u-dot-s-dot-shale-oil-boom-may-not-last-as-fracking-wells-lack-staying-power THE FRACKING PONZI SCHEME http://www.forbes.com/sites/insead/2013/05/08/shale-oil-and-gas-the-contrarian-view/ Why America's Shale Oil Boom Could End Sooner Than You Think http://www.forbes.com/sites/christopherhelman/2013/06/13/why-americas-shale-oil-boom-could-end-sooner-than-you-think/ FRACKING WILL CREATE AN ECONOMIC CRISIS http://www.guardian.co.uk/environment/earth-insight/2013/jun/21/shale-gas-peak-oil-economic-crisis