The shale boom that has transformed the oil industry in the U.S. will spread beyond North America before the end of the decade, sooner than previously expected, the International Energy Agency said Tuesday. Associated Press LONDON—The shale boom that has transformed the oil industry in the U.S. will spread beyond North America before the end of the decade, sooner than previously expected, the International Energy Agency said Tuesday, while at the same time warning of significant aboveground risks to conventional supply over the next five years. The use of techniques such as “fracking” to unlock previously inaccessible oil reserves in the U.S. have transformed the country’s oil industry, putting it on track to become the world’s largest oil producer by 2020, according to the IEA. However, a mixture of legal, political and investment constraints have meant […]