The U.S. Energy Information Administration, or EIA, has come out with the most recent global estimates for shale oil and gas, and not surprisingly, those numbers have been revised upwards dramatically since the 2011 report. In the video below, Fool energy analysts Joel South and Taylor Muckerman tell investors why we have seen such a sharp increase in the estimates of just how much oil and gas is contained in shale plays worldwide, and Joel takes us through several companies that stand to benefit in a big way as shale drilling continues to expand.