Cattle graze near water storage and a hydrofracking installation on the Eagle Ford Shale play in DeWitt County. The shale oil boom is going strong here south of San Antonio on a shale formation that stretches for about 300 miles across south Texas, one of the most prolific oil patches in the United States. Most if not all oil drilling in he region is taking place on huge cattle ranches where cattle still roam free. Flaring of excess gas in drilling for oil is also a by product that's vented into the atmosphere releasing all sorts of volatile organic chemicals causing air pollution and climate changing methane gas.