High quality global journalism requires investment. Please share this article with others using the link below, do not cut & paste the article. See our Ts&Cs and Copyright Policy for more detail. Email ftsales.support@ft.com to buy additional rights. http://www.ft.com/cms/s/0/5e923e3a-51d3-11e3-8c42-00144feabdc0.html#ixzz2m9yJLw8r The most interesting message in this year’s World Energy Outlook from the International Energy Agency is also its most disturbing. Over the past decade, the oil and gas industry’s upstream investments have registered an astronomical increase, but these ever higher levels of capital expenditure have yielded ever smaller increases in the global oil supply. Even these have only been made possible...