Shale Oil & Gas has turned the US into an energy power house over the last 15 years. Will it disappear as quickly as it arrived or will it set to US apart for years to come? Within its short life, it has evolved quickly and our guest Matthew Bernstein now characterizes it as Shale 4.0. What were the previous iterations in participants, economics and output and what does the future hold? Matthew  Bernstein is the Manager of Shale Analytics at Rystad Energy, the independent energy data and analytics firm.