Figure 1: History of Horizontal Drilling and Hydraulic Fracturing

    This image is excerpted from a U.S. GAO report:

    www.gao.gov/products/GAO-12-732

    OIL AND GAS: Information on Shale Resources, Development, and Environmental and Public Health Risks

    Comments and faves

    keyboard shortcuts: previous photo next photo L view in light box F favorite < scroll film strip left > scroll film strip right ? show all shortcuts