Natural gas resource estimates like those produced by the federal Geological Survey and the Energy Information Administration have been criticized by market analysts and energy experts because they often give an overly optimistic and simplistic view of how useful natural gas will be as a source of fuel that can replace oil and coal. Resource estimates often include gas in pockets that are so small or so deep that it may never be drilled or produced at any price. The gas may also be in areas that are off limits or impractical to drill.
via U.S. Geologists Sharply Cut Estimate Of Shale Gas – NYTimes.com.
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