America's historic gusherBy Andy Serwer, managing editor @FortuneMagazine September 5, 2013: 10:53 AM ET (Fortune)Have you really considered what a massive game changer America's newly exploitable 100-year supply of oil and gas is? We're only beginning to feel the implications -- I'll get to some early effects in a minute -- but imagine what the world will look like in 50 year..